Billie Lauder on Quilterstv does a block with charms that is great.
Sew 4 blocks togather in a square. then measure 1 1/2 in from center seam and cut the block in 2 pieces then do the same on the other side of the center seam. Then sew them all back togather but dont put matching fabrics next to each other. Then cut apart the same way again and sew without matching colors.
It makes a block with a small 4 patch in the middle.