check out the 10 minute block tutorial. You could go with a solid center and solid sashing between the blocks. I love the 10 minute block cause it goes together so quickly. you can make the starting blocks any size. I did 9" blocks and the end block was 17".
http://www.youtube.com/watch?v=ZbTHlGGKMPM&NR=1
good luck, I love the fabric