This ROM was the first one I flashed to the N7, and it was OK, nothing flashy, but pretty stable.

This one offered inverted Google Apps, which most are nowadays, but it came thorugh a little problematic.  The system kept getting confused, and resorting to requesting for permissions constantly, which was the eventual reason for its demise on my device.

As most ROMs with an AOSP base, it offers a fair amount of customization ability, including the addition of Lockscreen weather, calendar, and color change.  Although I am not interested, it also offers AOKP toggles, which some think are good.  The speed of the ROM was good, along with the transitions from app to app being buttery smooth, something we've grown to expect with the device, in general.

Battery life seemed largely unaffected with the change, or if it was, I did not notice a marked change, better or worse.  That said, since the battery life, for my device, is more than sufficient, I am not too concerned with it.  The ROM did give the ability to undervoltage the device if you wish, but I usually stay away from it, unless I am very comfortable with the stability and quality of the ROM, in general.

IMHO, I would probably say that the ROM falls under the "meh" category.

http://teamicemods.com/baked-downloads/

Lately, I have begun to see some buzz related to the various ROMs offered for our beloved Nexus 7.  Strewn through this forum, and others, I have seen various lists of the ROMs currently available for the device.  I felt that since each list has some minor differences, I would try and compile all of the ROMs I could find, along with a quick synopsis of each one.  As time goes on, I will flash each one on my device, and post some of the notable findings/bugs.  Please, if I have missed any, send me a PM, and I will add it to the list.  I will be obtaining the information from the various forums I am part of, and other repositories, and will try and note them all at the end.  Also, as the list is going to be sizable, if a new version of the ROM comes out, and I miss it, please send me a PM, and I will update the link. 
Thanks, and happy flashing!
•   CodenameSammy 1.2
o   This ROM is based on Samsung’s Touchwiz platform, and comes with all of the various UI enhacements offered by Samsung.
o   Includes the following apps:
   GApps
   Pop up Play
   MX Player
   Flash Player
   Playboard
   ROM Manager
   Smart Rotate
•   TeamHorizon XenonHD vXV (JRO03R)
o   Apex Launcher
DSPManager (JB) added with all the binaries.
Apollo Music player added and fixed for JB.
Proper extended power menu.
180 degree rotation enabled.
Navigation bar button pressing speed quickened. (Galaxy Nexus only)
Scrolling cache improvements.
Support for caller display name.
Developer settings as shortcut option.
Digital clock widget added.
Added XenonHD wallpapers.
Louder output on speaker for Maguro and Toro.
Added Galaxy4, PhaseBeam and Holo spiral wallapers.
Wi-fi scan time to 100 to save battery.
Performance, battery life and other misc tweaks.
Init.d support with added tweaks and scripts.
SuperSU application for root.
GPS and Camera fixed.
Reflective soft keys.
Build.prop tweaks.
Battery life tweaks.
•   SmoothROM v3.1 (JRO03R)
o   Liquid Smooth ROM
o   Lockscreen Mods - Slider, Rotary, Sense, Lense, Ring, Circle, Honey, and Halo.
o   Lockscreen shortcuts for phone, messaging, and other apps
Lockscreen shortcuts for Phone, Messaging and other Apps
o   Different battery types
o   Reboot menu
o   Configurable text colors
o   DSP Manager
o   Titanium Backup
o   Superuser v3.05 and different binary
o   GApps
o   Liquid Toolbox Settings
o   LED Notification
o   Overclocking Menu
•   Cookies&Cream 1.1.0
o   This is the ROM I currently use, and have been using for some time.  Thus far, this is my favorite ROM
o   Based on AOSP
o   Awesome Boot Animation
o   Once trebucket was fixed, this has been problem free.
•   TEAM SHOGUN AOKP Builds V4 (4.1.1)
o   Another AOSP build
o   Root & Busybox
o   SuperSU
o   Bash Shell
o   Unsecured Boot.img
o   Trinity Kernel
o   Ad Blocking
o   ROattion Toggle
o   Power Toggle
o   OTA Support
o   User Management

•   BAKED Grouper Blackbean #5 (4.1.1)
o   AOSP Base
o   Includes Aokp Toggles
o   Includes Powerwidgets
o   8 Lockscreen shortcuts
o   Lockscreen weather
o   Lockscreen calendar
o   customized MMS App
o   DSPManager
o   System apps and Gapps inverted
•   CM10 kang alpha (4.1.1)
o   TEAM SHOGUN MIUI JB 1.6.1 (4.1.1)
o   Based on latest MIUI & JB Frameworks
o   Deodexed
o   Zipaligned
o   Busybox
o   init.d support & scripts
o   faux123 Mainline Kernel v11
o   DPI set to 240
o   3 Way Reboot-Menu Mod
o   No Carrier ID
o   Some Google Apps
o   English language default
o   USA set as default country
o   MIUI US Weather
o   No default MIUI recovery
o   Full MIUI theme support
o   Full browser flash support
o   Google Now
o   Nova Launcher
•   Official AOKP JB Build4
o   Custom Navbar
o   Custom ICS Based Navbar
o   Customizable Lockscreen Ring
o   Alternate default app picker
o   Menu UI Overflow Toggle
o   Option to disable vibration for Notification expansion
o   RAM Bar in the Recents panel
o   Timeout and instant lock options for Slide lock
o   Different icons
•   Bugless Beast (AOSP)(4.1.1)
o   Based on AOSP firmware, which provides stability, and a similar feel to stock.
o   Includes core Google Apps
o   Google Wallet is included

•   Kaos Droid v3.7.3
o   Android 4.1.2 - Based on CM10 JZO54K AOSP
o   Stock Kernel
o   Motley Kernel
o   Faux Kernel
o   Aroma Kernel
o   Optional Flash Player
o   Optional AOSP
o   Landscape Support
o   SU Binary an SuperSU
o   Busybox
o   Lower Nav Bar

•   Codename Android 3.6.0 (JRO03R)
o   Based off of Clean Android 4.1.1 Rev6 (JRO03R)
o   Included File Manager
o   T-Mobile Theme
o   Trebuchet Launcher
o   Volume buttons move the cursor while typing
o   Custom Camera App
o   Customizable Messaging app
o   SMS Templates offered
o   CM Customized Phone app
o   Customizable Status Bar
o   Custom Notification Bar

•   CleanROM 1.2.5 (JRO03D)
o   Aroma Installer
o   Custom O/C kernel with GPU OC by _Motley! - Stock kernel is HERE if desired!
o   Optional Tablet Mode Mod by barrmulio (Experimental!)
o   Nova Launcher or Stock Launcher!
o   Standard Battery or Battery with Percent
o   Advanced Reboot Menu!
o   Tweaks for battery and performance!
o   init.d Support!
o   Zip Align on boot!
o   De-odexed!
•   Kyorarom Serenity (CM10)
o   Rooted
o   CM10 built from source code
o   Serenity Kernel
o   Overclock GPU to 480MHz
o   Tablet UI (switchable) (thanks to SGT7)
o   720p Video Recording
•   MCR Jr7 (JRO03D)
o   Based on the 4.1.1 / JRO03D release
o   Tweaked size of bottom navigation bar to make it consistent with the rest of the UI - big improvement!
o   Option to move to the right hand side of the device in landscape mode
o   Added initial support for contact sync via the Facebook app. Further enhancements to follow, but basically functionality should now be working
o   Flash player with stock Jelly Bean browser included. Optional BBC iPlayer
o   YouTube that allows preloading
o   Multiple button configurations (stock or dual 'active when hidden')
o   'TweakDeck', improved and updated Tweetdeck
o   All Google components are running the latest
o   SuperSU from ChainfireXDA
o   SQLite performance patch
o   Not odexed
o   Insecure boot image
o   Camera Launcher
o   Disabled Jelly Bean 'disable apps on boot' feature
o   LatinIME with forced Phone layout
o   Launcher with rotate support
o   Nova Launcher as default launcher
o   Apex Launcher a secondary option
o   Alternative appstores (Amazon, GetJar patched for maximum compatability and SlideMe Market)
o   Our own 'OdexMe' on-demand odex application
o   Enhanced Power Menu by djmcnz (updated for JB)
o   ClockworkMod ROM Manager
o   Disabled menu key unlock
o   Titanium Backup
o   Disable camera shutter sound
•   MIUI-2.8.17 v0.1 Alpha (4.1.1)
o   This is an alpha right now, and has history coming over in Chinese.  I am going to wait to look at this one until it comes to beta.
•   EUROSKANK Jellybro (4.1.1)
o   This build is primarily a Cyanogenmod 10 kang.
o   Virtually a CM10 nightly build
•   AOKP Nightly (4.1.1)
o   AOKP Project
o   Includes all AOKP updates
o   Themes
o   Dev is extremely helpful
•   prerooted STOCK JRO03D
o   Android OS, 4.1.1 Jellybean build JRO03D
o   Insecure boot.img
o   Rooted with the latest superuser
o   Busybox
o   Deodexed and Odexed options
o   Fully Zipaligned
o   Flash from Custom Recovery
•   Glazed JellyBean Version 1.1.2 (4.1.1)
o   Android 4.1.2
o   Beats Audio
o   XLOUD
o   Sony Bravia Engine
o   Odexed
o   Franco Kernel
o   Ad Blocking
o   Flash Enabled
o   Theme Manager
o   Camera App
o   Weather widget*Beats Audio

Hello all, I got my N7 last week, and so far, like it far better than my Samsung Galaxy Tab 10.1.  I'm looking forward to spending some time here, and if there's anything I can do, please let me know.