You can grab the latest Nexus 7 stock firmwares here. This is for those of you who want to return your Nexus 7 completely back to 100% stock. If you have a rooted Nexus 7, then you can grab the stock rooted ROM (which is same thing as stock firmware but with root), which you can easily install using CWM or TWRP recovery.
Download Android 4.4.4 KTU84P Stock Firmware for Nexus 7 (original 2012 model) [Latest]
Download Android 4.4.4 KTU84P Stock Firmware for Nexus 7 3G (original 2012 model) [Latest]
Download Android 4.4.4 KTU84P Stock Firmware for New Nexus 7 (2013 model) [Latest]Need Help? Best way to contact me is on Twitter!
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Nexus 7 Reference
You will need a rooted Nexus 7 to install all ROM/kernels.
First time to rooting and custom ROMs? Please see our Nexus 7 Root FAQ FIRST!