One day while we were in Target I glanced through their little $1-2 section in the front of the store. I've found some gems there (like Dwight Schrute post-its), so I look every time I go. That day they had these little jelly window cling things for $1. I hid them from Sophie for a rainy day -- which happened to be the next day.
I think that's the only day she played with them on the window. Since then, they've been on the fridge, the dishwasher, the floor, the walls, on Ivy, behind the couch, and in her mouth. Now they're in the trash.
Another day I got brave and brought out the paints. (Yes, washable.) I bought them last year so I could do hand/footprint cards for all the grandparents, and forgot I had them until a few weeks ago. Steve's parents were coming to visit for his dad's birthday, so I had Sophie paint him a card after her afternoon nap.