I was thinking more about this, in my thrift store UFO stuff I have some large 1970s era cross stitch blocks on the preprinted fabric. The blocks are large, like 16", and the stitches are too, maybe close to 1/4"?? Unfortunately for me, the blocks were printed on really flimsy backing fabric. Some of those kits were nice reasonable fabric. I plan to line/back the blocks and prequilt inside the open areas of the design. I've cut sashing for it and will then put the whole top together with a full batt.
I'm going to wash it -- but it won't be in heavy use and since I didn't spend the time on the blocks, only maybe $5 at the thrift store, I don't mind taking the risk for the amount of effort I'll be putting in.