What are you using for the backing? maybe that could give you an idea, but as others suggest, I would use a print with 2 or 3 of the colors.

It looks nice as it is, but if you want to add another border I think a striped border with the colors from the blocks would look nice. I love your quilt.

I think just a fun binding would look great!!!!

Just go shopping!!!! I'm sure you'll find something!! :)