I am all for an I Spy quilt. Make the top and then add borders and backing depending on the gender of the babies once that is known. One of my girls is purple and one is pink. I knew they were girls so I made one for each in their color Delectable Mountain quilts and a turning twenties quilt. For boys one could be green and the other blue. If you make the I spy quilts 50x50 or 45x60 they can use it for a long time after babyhood for lap quilts.