Stoo : you only need photoshop or maybe not.

How it will work :

We have a big design sheet (each theme has its own copy of it but the structure is the same) it's a big psd file, with all the graphics canola needs for a theme. They are already "sliced" correctly, named correctly so you can for example just change the icons (copy others on top of each icon) hit export to web as pngs (only the used slices) and them you have a folder with all needed graphics. With this folder you can zip it, upload to our webservice and the server will compile and return not only the compiled theme but a installable debian )

Marcelo