My wife ran across an idea for making home-made coasters using glazed tiles, sharpies, and rubbing alcohol. You start with a plain white tile and scribble on it with rainbow sharpies. Then you spritz or dropper alcohol onto the ink. The alcohol makes the colors run together and then it evaporates, leaving the color smears behind.
Sometimes you wind up with these weird almost burned looking effects (I think probably where alcohol has puddled too much). You rarely get quite what you expect. The tiles are dirt cheap, and it’s a quick, neat craft. Once we figure out how to seal the colors in, we’ll have a nice new assortment of coasters, and we’ve talked about figuring out a way to mount these together somehow as a wall hanging in the kids’ playroom.
My tiles are the rainbow one in row 4, column 3 and the one with lots of sort of marbled whitish space (intentional but not exactly as I had intended) in row 3, column 1. I think the top left one looks really neat — like something the Hubble telescope would send back — but my son was really disappointed in it. The one to its right has some neat striations that I think were the result of blowing the pooling alcohol a little.