My youngest boy has ADHD and has been working recently with Artlink for art therapy. One of the Artlink guys he has worked with is a spray artists Fraser (
https://www.instagram.com/frasergrayart) who does some seriously impressive scale works. They have done a few things like canvas prints and they sprayed an old bike frame with the intention of respraying his BMX.
However i suggested that the garage walls could do with brightening up so suggested they do a spray mural on the wall. Gave the boy free reign to do whatever he wanted with the hope it would be quite a cool garage feature. Results below which IMO have turned out epic.
Bit of tidy up on the skirtings needed - should have masked that off to start but a great result.