I've been developing an application lately. It basically splices input images into components, so you would insert an image for the main windows, and it would convert it into the main windows. It is very easy to add new components - you don't have to decompile the program or anything, you just add a file to the components folder of the application.
Download it here
I've done part of the main window, but since I don't know enough about the layouts etc. I would appreciate it if someone did the rest of the main window, equalizer, playlist and other components.. you will get credit
Full instructions on how to add components provided in the zip
You'll need the .NET framework to run the app (about a 20MB d/l, but worth it - more people are dev'ving now in .NET languages), which you can get here