Thanks for all the replies everyone.

He had an episode of drawing on the walls again today and also scribbled a bit on my wheelchair, but I managed to wash it off. Chalkboard paint sounds like a cool idea too- I'm sure my kids would find use for that as well.

I can't really figure out why he's suddenly gotten this way with his drawings. I'll have my T try to help. Fox has spoken with people I know, and he told my girlfriend he draws it so "I will see" but I'm not really understanding what he means.