Print it on colourful A3 paper, laminate it, and get it up on the board to start celebrating mistakes and the learning that they yield!! I found this a useful way of encouraging students to engage proactively with their mistakes and seeing them as a means of growing their brains. Particularly in mathematics where students were often paralysed by fear of mistakes. You can even get students to come up and write their mistakes on the board, write mistakes with their corrections, and use them in lessons as a tool for recapping previous learning.