Idea to include in quiet time box: Hot glue rubbing plates. Make your design with hot glue on a square piece of cardboard, let dry and then hand it over to the kids with some sheets of paper and crayons to rub over.
Indoor Activities for Kids: Homemade Lava Lamps. Vegetable oil, a about of the water bottle, then water. 10 drops of food coloring. Then take a alkaseltzer tab and break it into 4 pieces. Drop one in at a time and wait for each to dissove!