Maybe I should not say rainbow colored because there is no purple/violet. I love the purple and violet hues and I think they make vibrant serving pieces. But the purple pieces sit on the shelf for a long time. So it seems to me that most people don't see purple as a decorating color or an accent color choice. I have a few bowls that are dry and waiting to be decorated. Maybe I'll do a couple in purple just to fill out the rainbow idea.