What hair styles and colours suit a rounder face and are more slimming?

Styles that come onto your face like a long layered cut feathered onto the face. Anything that covers the corners of your face will make it appear oval thus making it look slimmer. Lots of celebs have round faces but have the right hair style so that we think it's oval.What hair styles and colours suit a rounder face and are more slimming?
A bald head