I grew up not far from Greensburg, Kansas, the little town that was wiped out by a tornado earlier this month, and the stories of destruction and rebuilding have been of particular interest to me.
A knitter in Kansas wanted to make an afghan for the family that her church "adopted", and she put out the call for donated squares. Judging from the size of the mailbag she received recently, she may have enough squares to make afghans for many families.
Her suggested pattern is a simple diagonal garter stitch square. (The instructions are on the blog link, above.)
If you have some wool or wool blend worsted marinating in your stash, consider making a square or two for this cause.