Seriously considering this..... Even his bedroom. Yes..... His bedroom can be the first to go.
So far today I have found purple crayon scribbles on the back of the bathroom door, green pencil marks on our bedroom wall, play-doh in the pockets of my dressing gown, red (bright sodding red) crayon on our white hall walls. Our bathroom grouting is a sort of rank, cobalt blue colour and there's a funny looking brown duck amongst his yellow pals on the shower curtain 
I have been wallpapering today and all these things must have passed my sleepy eyes before now as Ds isn't even here today. He's gone to be 'my darling boy' at his Gran's house for the day. 
Would it be awfully, awfully wrong to give his bedroom away to the ironing pile? He can sleep in his giant pencil case I'm sure.