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My kids prefer pens! There are artistic scribbles around 2 foot in height all the way around some freshly painted rooms and more painted smiley faces than I care to count. They are so proud of it when they show you it is hard to even get mad.

Side note, there are still 52 gallons of paint so I can cover up their creative scribbles and they will forever remain a part of the history of the house : )

Or just give them a whole new "canvas" to creato on again ;)
That last thing you said was so sweet. Not all parents think like that...

I think it was all planned by their mother, they only seem to do it on the colors she doesn't like. She is really smart if she has the 4 y/o doing her bidding already.