Are you on Ravelry? If not, you should think about joining! www.ravelry.com
You do need to request an invitation to join, but I think they email back to you within a day or two of your request. It's well worth it! I found a KAL there for the o-wool afghan. They are doing one square a month and started in September-- you might just start in w/ December and then catch up as you can. The first couple of squares can be seen here (scroll down through the blog):
On ravelry there are several groups dedicated to knitting afghan squares, some for charity, some for swaps, some to try out new patterns. I think you may find just what you're looking for there!