If you come to our house in the near future (who am I kidding, it will probably look like this for months), you might be a bit turned off by the sidewalk art turned paint-the-house art. Last week it was chalk. This week, it was paint from Aunt Sarah. No worries...it washes off. BUT, I haven't tried to wash it off yet. Not because it's extremely beautiful, but because I'm lazy.
And, more than likely, it will happen again as soon as it gets washed.
And, if some unapproving guest pops by, then, well, they'll just have to not approve.