Take a look at the BQ and BQ2 patterns by Maple Island Quilts...if you don't have enough of your prized fabs to get the largest square requirement, you could "build" a patchwork block of your smaller yet similar pieces up to the required size. I "framed" some interesting fabric to get to size. I think you might get an interesting design that would be unique to your quilt but would still showcase your special fabric. Just a suggestion.