I don't know how minimalist it is, but poweramp has a white skin. You can download the trial version and test the white skin. If you don't like it you can uninstall it.
You can choose a Winamp widget that is a single simple bar controller. I keep it on my home screen. The nice thing is that you can press the lightning bolt to get a full screen with album art.
im looking for something a lot simpler, without a background even. Think typo clock for music players. Thanks for the suggestions tho, I checked out both