My guild has done a Paint Chip Challenge where you match the initials of your name to the names of paint colors on paint chips and then you have to make a quilt using those exact colors - paint chips are pinned to the quilt for judging. We also had a challenge where we had to quilt a song - we could pick any song and the quilt had to be between 24" and 45" on each side and have 3 different kinds of embellishment.