You may know Anna Marie Horner from her fabric designs. She has started a quilting project to help those affected by the floods in Tennessee this past spring. She lives in Nashville and saw the devastation first hand. If you have any 12" blocks laying around, I'm sure they would be put to good use.
Or, play around and make some new ones. Reduce those scraps so you can buy more fabric! There are color suggestions, but basically you can just play.
Here's the link: http://www.annamariahorner.com/rainbow.html