You could make a fan quilt. I made one for a raffle for our new Home Extension office. They are not that hard to make and you use a lot of colors. Also you could do a DP9 patch with different colors. Or a trip around the world. Made one of those for a raffle done it in rainbow colors.They way I made the trip around world was by the squares. layed them out and then sewed up the rows. Not like doing it with the strip way
Any pattern that you enjoy making is the way to go and yes do a queen size. Have fun doing it also