219 - Colour Scheming

I need to figure out a colour scheme for a set of these silhouettes. I was thinking of referencing Henri Matisse, but his cut-outs were often on a white background and I'm thinking of a black background. All one colour? Or a different colour for each silhouette?

I want to exhibit them in a hospital corridor - so in that setting, the viewer won't be able to step back to see the set as a whole. They would be walking past each one with a close up view.