Amy from The Idea Room seriously gets my vote for the funnest mom in the world. She is always coming up with really great activities for her kids, and the best part is that they are SUPER easy to pull off! So you know she isn't all stressed out after putting them together for her kids.
We don't have snow on the ground, or I would be using this idea for snow paint:
Food coloring and water. How much easier can you get? And I know that my kids would think this was the funnest thing in the world. I will have to remember this if we get a day of snow on the ground like we did last year.