Oh, I think that is so fun on point! Looking at the mix of colors, I'd probably look for a yellow solid or light print and set up the blocks so the existing yellow ones aren't next to the setting triangles but more together in the middle. I'd probably go with a similar print binding maybe blue with pink and a bit wider than normal even. But I often punctuate the ends of my quilts! Subtle works too but I don't think this binding needs to be shy.