I make charity quilts and have a lot of small scraps left over. I sort them in two bins, one for larger pieces, one for smaller ones. Then I just pull them out randomly and start sewing them together into a crazy quilt square. I do this until I have enough sewn together to trim up to a 7" square. I do this until I have enough for a quilt, then I lay them out and pick a color I like and use that for sashing between the blocks. The sashing helps the quilt to not look too busy.