I recently finished two quilts for my sister. None of which were crocheted. But I fused them to a block of muslin, starting with glue baste it and then crazy quilting them to it. They worked well. Glue is soluable and washes out. My hankies were all different sizes also. So I cut them and fit them on the muslin. Picture of mine on this sight under Hankie Quilts, if you would like to take a look. Good luck.
Judy