Hot water + Dry Ice = Fog!!!  Fog is made by submerging Dry Ice into hot water.    To achieve thicker fog, add more of both dry ice and hot water.  The effect you see in the photos was created with a quart of hot tap water and a half a pound of dry ice.

Hot water + Dry Ice + a little liquid dish soap = Fog Bubbles!!!  This effect will last a bit longer than regular fog and you can play with it.  Pick up the bubbles, pop them and out comes the fog.  Again, more dry ice, hotter water and more soap produce Fog Bubbles on a larger scale.