http://gbatemp.net/threads/custom-3dsthemes-requests-quality-check-and-advice.415286/
These might also help if you end up with other questions.
Watched your video, Agree with the most part, mainly about bad color scheme decisions , (Also bad gradient color choices which you didn't cover there, but sort of fall down on color schemes).
Anyway, what i meant to talk is that I'll take in consideration changing the default extension on loading themes to just ".bin", maybe add a shell handler under "Edit" to directly launch the theme file via the right click menu (not double click probably, since bin files are rather common, and i'd rather avoid a general association to the bin files)