When my oldest daughter was in grade school, I was her Girl Scout leader and one of our projects was to make sit upons. We used a vinyl tablecloth and stuffed them with newspapers and stitched around the edges with yarn and had the neatest sit upons for camping. Back then we didn't even realize we were being green, we were just being frugal.
I decided to play on that same idea and take a couple of placemats and opened one edge and stuffed it with lots of plastic grocery bags. And then because I have trouble sewing on a button, I used the iron on fusible web and iron the edge shut.
Here's the placemat before....
Pretty cute huh?
Be sure to check out all the other DIY's on A Soft Place to Land.