I like the idea of "t-shirt" quilts. You could actually use shirts supplied by the customer so the quilt would be "one-of-a kind" with interest to them. Figure out cost of batting, and backing plus profit you want. I feel that you never get a reasonable wage for your labor but since you time is "free" since you are retired just think about profit and what quilt would sell for. Make a couple of sample quilts for set ;pricing and then show them ar craft shows. Take orders. I would rather sell 5 $10 items that no $50 items. Good luck!!!!!!