Any scrappy block like the square in a square (I'm thinking the 9 patch one with a square in the middle and a contrasting fabric in the rest of the spaces). Chinese coins. 9 patch (either the 5/4 configuration) or all scrappy. A scrappy samples with lots of different blocks. Cut in longer strips for a jelly roll race like quilt. Any string quilt. I've used the one like Franc36 mentioned (diagonally on 10" squares), and I used phone book pages for the foundation.