Ice bubbles, Abraham Lake, at the foot of the Rocky Mountains in Canada. The rare phenomenon occurs each winter in the man-made lake, as the plants on the lake bed release methane gas, which freezes as it comes closer to the cold lake surface.
*Colored ice balls* Fill balloons with water and add food coloring- red and green would be great around christmas! (be careful not to let the food coloring escape!), once frozen cut the balloons off and voila! Look like giant marbles :)