Well, this is the Wood themepack, based upon the wonderful WoodAMP theme by
Familjen Bengtsson.  He was gracious enough to let me modify his original
skin for use with Gmp3, so kudos to him.  It looks great! :)  
If you wanna check out some of his work, here is his page:

http://hem.passagen.se/fambsson/ampskins.html

Brett.