Well any color would be great! But I think red...

Red would be my choice. There is just enough of it in the fabrics for a red binding to pull it forward.

I was thinking red too. I think one of the darker colors, like red, would put a nice frame around the quilt. Red is in the monkey, the focus of the quilt. Cute quilt!!!

I think that lime green would be nice. If you have any 2 inch pieces long enough for binding, you could make them work also. The flange binding on the QB that you sew on the back and flip to the front, using pieces under 2 in width.