I decided to try the 10 min blocks I saw on You Tube. The blue flowered block - the center block is the same size at the outside blocks. (4X4) The pick flowered one - the center is 1 inch larger than the outside blocks. (4 1/2 with 5 1/2 center)The blue flowered with beige center - the center is 2 inches larger than the outside blocks. (4 1/2 and 6 1/2 center)I just wanted to see what it would look like with a different size center. I kinda like the larger ones. I haven't decided if I'm going to leave the center square or lay it over like a Cathedral Window. But these were just for fun.