Do you have a favorite that you have already made? If you make the same pattern then you may have more confidence in making and quilting the quilt. Are you going to send it out to be quilted? If so then maybe you can use a more compliated pattern since you will not have to worry about the quilting. Also the type of auction and the group it is for may help you determine which quilt to make. EG. lap size for handicap, childs for children home, . If I am making a quilt to give away then I try to get neutral color that will appeal to many. Show us what you decide! Good luck.