my current solution is a beat it before it happens solution......
wich may not help you...
Post it brand has sticky memo paper that is about 2 feet x 2 feet.
It is ment to be a poster board.. but has adhesive on the back that is then enough it comes off easily.
I have this in places on our walls just so she has a spot to draw on.
When full.. I remove it, and put up another piece.
it is cheap.. 12 dollars for a package of 18 sheets.
Might help
then again, it might encourage MORE wall drawing.. but NOT on the paper..