Drumbitious App Color / Style Variations

Hey guys, I'm working on some different style variations for our upcoming drums teaching app. We sorted out a lot already, now thinking about directions A, B, C or D.

I'd love to hear some opinions from you guys even tho nothing here is finalized so don't worry about content and stuff. :)

App design is created in Sketch, for the angled view I've been using "angle" sketch plugin.