my leftover scraps get cut into 1.5" stamps to be used for other swaps or future projects, maybe even a postage stamp quilt someday. if there is a big enough piece leftover, it gets cut into 2.5" strips for future use and the rest of the scraps are in a bag for a future pif board giveaway.
i must admit i am not a true scrap keeper but others benefit from my scraplessness (is that a word) so it all works out by my thinking. :-)