Several have mentioned auditioning different fabrics...along that line you might consider asking a friend that has several large pieces of fabric of differing colors and/or patterns (if you don't have a large variety in your own stash) if you could borrow them. Lay all the blocks on one of the fabrics and take a picture with a digital camera. Do this for a variety of fabrics. When you view them in your camera/phone they will appear quite a bit smaller, giving you a different perspective, and you can scroll back and forth to find just the right one.