Being a Burning I naturally transformed this into something else. Grabbed a red tee-shirt I had and used the pens to "write" flame patterns on them. Drop it in the wash. And a pretty cool tee-shirt with a flame pattern comes out the other end.
Then I got yelled at because I'd used up 2 of the 3 she bought, and none of it on laundry (
This was a natural outgrowth of another idea I had - Get blank stencil material from the craft store. Cut out a burning man pattern in it. Hold it up to a black tee-shirt and use my air brush to spray a fine mist of bleach onto the shirt. Wash. Enjoy. Where the bleach hits the black disappears, and the man lives.