What type of frame should I use for this work of art?

The piece that I frame is a cartoon of small contemporary / modern black and white. It comprises mainly of circles and rectangles. I was wondering what kind of image should I use? Wood? metal? What color? not framework? Please help!

I like the Red Way looks with black and white. A metal frame red would look nice, maybe about an inch thick. It would be cool to add a thin black stripe small image too.

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