I have only done 1 I Spy quilt, it was dor my DGD. I used 5" finished blocks with sashing . I shopped at various stores to finally have enough blocks. I also used the printer fabric to do pictures of her cousins. parents, grandparent, aunts and uncles. Everyone loved it. I am now planning to do some for charity and would love to find fat eights or squares at one place. Go for it!