The black one is really cool! Just not feeling the squared buttons. I didn't know you could theme like this (never thought of theming OS X in general). Now because of this thread, I'm going to try to look for a black theme but keeps original iTunes buttons/looks!
Good work though!
To use ThemePark you need Leopard. Are they are alternatives that work with Lion?
It works on Mountain Lion flawlessly but on Lion it will crash if you don't resize the window to a certain size.