A few years ago I received a "quilt" from my friends as a going away gift. There was a catch: the gift included MY making the quilt! It was a basket with all the fabrics, batting and backing for a quilt, and each one signed the backing fabric using a fabric marker. You could use the idea and have family members sign muslin backing. I do recommend that you make sure they sign inside the areas you plan to use: I lost a few signatures because they were so far away from the majority of names that they wouldn't fit even for a queen sized quilt. The one advantage is that I could put together any top I wanted because the names are on the opposite side. Good luck!