If you have 11 blocks, think in vertical rows. do a 4, 3 and 4. Without sashing, this would be approx. 72" x 54". With sashings and borders, it could be a good sized top. I would then take the center row (the 3) and add extra sashings or whatevers to make fill out the additional 18" (works out 6" per block, 3" per side - not too much). If you have a bunch of the additional fabrics, you could get creative and so small blocks (1 1/2") or a piano style, or just strips. PLease be sure and post whatever you decide to do.