Didn’t you mean to make that green unicorn pink? No problem, erase it! Ooly's Make No Mistake erasable markers can fix your mistakes in an instant for no-stress colouring. Each of the 12 brightly coloured marker pens has an eraser on the other end. Try deliberately erasing some of the colours for a cool design effect, too.
Check out the Un-Mistake-Ables erasable colouring pencils and Presto Chango erasable crayons as well.