If you can't afford PS or don't want to acquire it through dubious means, you can just DL Gimp. It does most of the same functions, and is absolutely free. This is what I've used to all of my UI Art editing and such.
EDIT, making you're own kgpanel art was a bit more complicated then i thought, does anyone know a guide using Gimp or Paint.net? The one above is kinda good for nothing without PS and i have no experience what so ever in this area
---------- Post added 2013-04-08 at 07:51 PM ----------
Chult, would you mind giving me a quick walkthrough on how to make a custom piece of art?
Lets say i want a simple black 1px circle kgpanel, how do i do this in Gimp or Pain.net?