I've had this happen just this past year - needed 6 large lap/couch - 60 x 72- quilts in 3 months. My plan on this when it happens is to chose one truly complex quilt block - and enlarge it - make the individual squares 4 - 6 inches....
The other trick i use is the method that we all learned when water-color quilts were so popular - fuse your squares in their pattern to lightweight innerfacing - sewing is a snap. Good luck !!