You may use any fabrics you wish for crazy quilting. I prefer using the "Fancy fabrics" such as Silk Dupioni, Moire', Satin, Brocade, Velvet, Burn out velvet, and some cottons with metallic accents. This is just my preference. You may use 100% cotton or even Lame'. It is your choice. The more variety of fabrics as far as fiber content, the more texture your project will have. I think it is more enjoyable to embellish various textures in a crazy quilt project. Although fabrics can be found just about everywhere, one of my favorite sources is old clothing from tag sales,estate sales,Antique shops,and those found around the house. I mean really, are you going to wear those old bridesmaid gowns again????