I'm releasing all of my resources on this project with an MIT License, so anyone can modify, re-release or do whatever they want to with what I have so far.
Main Player

Micro Player Double Height

Micro Player Normal Height

Known Bugs
The float player was never finished, so it's very broken.
The micro skin player buttons do not match the main player's. I originally had an idea to make them glow orange when hovering, that didn't pan out after I made the main player. I just never got around to going back into the micro and redoing the buttons.
Sometimes, when loading MediaMonkey, the micro skin does not work. Restoring and closing back to the micro player seems to fix it.
The main theme was never styled, because I didn't want to spend a lot of time with trial and error tweaking colors.
-- I guess this is a bug -- I won't be maintaining it. Heck, I won't even be subscribed to this thread, so chances are I won't see your replies. Don't ask me for bug fixes or make feature requests. Take the resources I've uploaded and run with them!

Skin Folder
Yes, folder. I didn't even bother making an installable skin file, that's how much I've lost motivation.
Double Height Micro Player
http://solidaredesign.com/mmskin/MetalFrog.zip
Normal Height Micro Player
http://solidaredesign.com/mmskin/MetalFrogMini.zip
Skin Resources
All the PSDs that I've used to piece together my skin.
http://solidaredesign.com/mmskin/MetalFrogPSDs.zip
Enjoy!