On a damp, cold day try taking bubbles outside. The perfect day is one where there's some ice on the ground and the temperature is hovering right at freezing. If you have a bubble maker of some kind, take it with you. Blow as many bubbles as you can right at the ground. The dampness and the cold let the bubbles "live" longer than usual and you can create an entire field of bubbles like this one, perfect for stomping.