5 to 6 inch Squares, definitely. You have more enjoyment getting colorful prints that repeat at 10 and 12 inches. Then you can fit a whole dolphin (or witch) into the quilt block, rather than chopping the images to fragmented bits in a 3 inch. If you want a grand selection of Eye Spy prints, I will be putting some for sale, which I've used successfully in 3 children's quilts.