There is no wrong color with this fun quilt. You have so many good ones in the quilt. What I do when I am undecided, is to tuck about a 5 or 6 inch section of the fabric under the quilted top and take a picture. You can use multiple fabric colors and see which one you really want for the finished product. Another thought....With this quilt, I think a pieced binding with several of the fabrics in the quilt would match the overall fun, sampler look of the quilt. Just try not to let a seam end up in one of the corners.