I had a similar problem with my tumbler quilt. I took my almost completed top in to a fabric store and the owner and her mother helped me pick out a solid red that went with the red in some of the blocks. Solid colors are impossible to match up on the computer/internet. You need to lay the fabric together.
Those fabrics are gorgeous! I bet a solid pink and/or yellow would work really well.
And I think I remember seeing pink zebra minkee somewhere which would be perfect for backing fabric - so soft and cuddly.
http://www.google.com/search?q=pink+...w=1123&bih=606