I like to paper piece smallish (3-6in) log cabins and "Michigan" string blocks from Quilterscache.com. Narrow strings, anything goes ,plus off white/neutrals to "tame" the blocks. Left over scraps in a box and occasionally sorted by color as
recently for Xmas: reds, neutrals, greens where easily accessible. I do prefer my messy method:dump scraps in a big box as long as they fit in, then reconsider. I'm too stingy to throw anything away!