I don't sell UIs; I haven't taken money for one even once.
I made Candy's for her because she's a friend;
UI's take a bit of time to make and I get lazy; but I don't make them to make a quick buck.
There are several programs you can use:
Customize your UI with this guide here:
http://epicpw.com/index.php?topic=30476Or there's a program called UIedit that you can download -> Search it on forums, someone made a thread about it awhile back.