Actually I am in the process of learning a new meathod of creating images (I am REALLY bad at it right now LOL), can post images, but it is easier to create from requests. I will post some general tweaks tonight (volume, clocks....) Not all my own, but it will give you an idea of what you can do!!
Here are a couple really good sources though:
http://forum.ppcgeeks.com/showthread.php?t=28668
http://forum.xda-developers.com/showthread.php?t=354111
This site is relatively new, but has a lot of stuff and pretty well organized (will also give an idea of what I am trying to learn!!):
http://www.bob55.ca/