Here's the latest source code:

http://www.d.umn.edu/~bold0070/projects/scheme2theme/scheme2theme%200.5.zip

It's much more extensive now. This should work for buttons in all schemes and tabs in newer schemes (i.e. Scherzo!, System 7)

I'll have to putz a bit with some items in older schemes because some things are just color table shifts of platinum.