Past themes from our guild included making 25" squares or no larger than 25" in any one direction: With these hands, Winter,Spring, Summer, Fall, this is my favorite time of all. For our 25th anniversary, our pres. handed out a piece of silver sparkly fabric and we had to use it somewhere. Our guild page shows some examples. herringrunquiltguild.com scroll down to previous challenges. Some of these ladies have been together for over 25 years and have had some great ideas.