Crumb quilts are not made of,squares, they use every shape you can imagine. Much like the old crazy quilts but no embellishment. Crazy quilts were generally made from velvets, satins, men's ties, silks, and "fancy" fabrics and then heavily embellished with embroidery, lace, etc. A few were made of cottons. I think quilts made of small squares would be called "scrap" quilts.

It has been my experience that crazy quilts usually started with a center shape with 3 or 5 sides and you added strips in rounds.

Check Bonnie hunter's site for pictures of crumb quilts.