I do all sizes. 24" square or 24x30 make nice car seat covers. According to Quilt Your Heart Out Designs, a crib quilt should be 50x53. I do most crib sizes 44 x 54 (width of fabric x 1 1/2 yards). I've done floor quilts as big as 60" square. 60" is a nice size for cuddle time with mom/dad.