Another thought: is it possible to a) quilt invisibly, e.g. by sewing along the stitching between the patches on the front so that I don't make lines across them - my great uncle's quilt seems to be like that but it's been mended so much I can't tell - and b) quilt different patterns onto different sides, so it's attached both sides, e.g. by not pushing the needle all the way through? Is either of those a thing?