Tonight, in an attempt to turn things around with everyone's attitude (and also get Sienna to take a bath, because every time I try to make her do something she doesn't want I hear "I want DADDY!" and Daddy isn't around right now), I made some shaving cream paint for the bath tub.
This is my favorite kind of activity. It was fast, easy, cheap, the kids LOVED it, and it left the bathtub cleaner than before. I squirted a blob of cheap, white, shaving cream onto an old Cool Whip container lid. Stirred in some food coloring. Gave the kids paintbrushes and let them have at it.
When the paint was gone, I gave them each a rag and had them help wipe the walls. I had to change fresh bathwater, but I think it was worth it.