A simple pinwheel quilt using half-square triangles would be cute.
If it's for a little one, maybe back it in flannel or minkee?
Buy a good neutral fabric that would go with all of them to use as background fabric.
Quilters Cache has a lot of free patterns, just browse through them and something will jump out at you!
http://www.quilterscache.com/QuiltBlocksGalore.html