Occaisionally we have themes--last March we had a red and white theme which was kind of cool to see all the r/w quilts. Here's the link:
http://www.quiltingboard.com/t-101637-1.htm
If you wanted to do a Holiday theme you can as well. With Sept and Oct coming up--fall themes are great as well as Turkey for November. Last year we combined the Nov and Dec swap.