XDA forums are full of ROMs of all sorts, and for devices of all types. One can usually find a new version of Android for many of these devices much before the manufacturer pushes its official update—and that’s if they decide to do it at all. Most of these releases come in the form of CyanogenMod or AOKP builds. However, you can’t always find a ROM based on the latest version of Android for some of the less popular devices. Whether it’s that, or you just want to get into ROM development yourself, XDA Senior Member mithun46 has written a brilliantly detailed guide for you at the recently launched XDA-University forum to help you compile CyanogenMod 10, 10.1, and AOKP for practically any device.
The guide walks you through the entire process, starting from setting up the environment on Ubuntu 12.10, installing and configuring all the required software, pulling the source code, making the necessary changes to get it working on your device, and compiling it into an installable build.
So what are you waiting for? Check out the forum thread and start compiling your own ROMs!