If you have to ask why you’d want a paint roller that paints rainbows, we can’t offer you a sensible answer. Just because it’s cool, we guess? It’s the same reason we have for thinking Unicorn Finger Puppets are great. Because why not? In any case, the paint roller you’re looking at is not sold in stores. You’ll have to put in a little effort to make your own, but clear instructions are provided. Once you’ve finished, you can then set to add some color to your environment, which we urge you to do in a legal manner, of course.