Mammatus Clouds - "True to their ominous appearance, mammatus clouds are often harbingers of a coming storm or other extreme weather system. Typically composed primarily of ice, they can extend for hundreds of miles in each direction."
Using a macro lens, UK-based photographer Janet Waters gets up close and personal with all kinds of liquids, bubbles, food dye, and soapy water. Where many artists like to have control of their final product, Waters actually counts on the unpredictable nature of liquids to create her captivating abstract designs.
Spectacular Photos of Bubbles Frozen in Frigid Temperatures
Glow in the dark bubbles. [Warning!! Be wary about simply draining glow sticks into solution then dumping the solution out for kids. Some glow sticks have tiny pieces of glass inside (that's what pops when you 'crack' them to make them glow).]