There are no keyboard colors out yet in Cydia for 3.0, but I should be able to change it myself, right, by downloading one from 2.2.1 and ssh'ing into the correct folder myself? But I can't figure out where the keyboard is in 3.0
Even if you can do that via SSH I would be VERY careful you don't mess things up on accident, I'm sure it's easy to make a simple mistake that would force you to restore. There a reason why it's not on 3.0 yet.
allot of stuff is on stand by for 3.1 I would expect to see some stuff once 3.1 is out and jailbroken! enough things are expected in 3.1 that Cydia Dev are gonna wanna wait! but 3.1 is really that for off!