Another source of 'cheater' fabric can be your scanner/computer/printer. I did a king size variation on 54-40 where I scanned my first block (with a white center block), reduced it down to the size of my center square, and then printed up a bunch of reduced blocks and I used as them as part of the center squares on all the blocks in the quilt. When I machine quilted it, I stitched along where the seam lines would have been on the center block.
(in the photo, the printed fabric is lighter than in real life)