Back when we did our watercolor and painter's tape pictures, we found we had quite a bit of liquid watercolor left over in our repurposed applesauce cups. So as not to let it go to waste, I remembered that just that morning, I repinned a most nifty pin. I grabbed a handful of paper towels and folded them up into triangles for the little painters who wanted to continue arting it up and demonstrated that it was totally okay to dip their little triangles into the leftover paint.
They had a blast dipping away it was all I could do to wrangle them up for outside play time.
**here is the original source that the Land of Nod linked up to.