My ys just drew on our floors...(you can go round the downstairs in one big circle and he did just that, with a pen in his hand, grrr).
It came off fine, wiht some flash stuff of the laminate flooring and the tiles...but I daredn't touch the carpets, incase it just spreads the penmarks....
Argh...I can't bloody believe it...I am seriously pissed off!