Default [Q] Custom Themes Creation


So I have been wondering is there a way to create themes using the computer and then exporting them to applications like Themer and Buzz Launcher. I know this part of the forum is MyColorScreen, however, I believe this question is going towards all the launchers. I personally feel that it is difficult to create themes using your phone (I don't have access to a tablet). I have tried MyColorScreen and it is a wonderful app but it just doesn't have the features I want. So, do you guys have any programs that you use?

I am trying to use GIMP to make my own icons for now but the application UCCW is what I am mostly interested in. That app is powerful, but as you already know it is quite tedious. Any way to use it on the computer?