Color Me Frugal
Gelling your light sources for color accuracy (matching your flash to that tungsten light bulb in the room) or effect (giving a background a slight touch of blue, for example) can be the difference between a good photo and a great photo. In fact, Strobist already has two of their four articles on just this subject (here and here).
They cover using gels in order to match light sources that are too warm, like tungsten, or just plain hideous, such as fluorescent. They mention all sorts of gels, like CTO (color temperature orange) and minus green, but they don’t mention the cost of those gels. Wouldn’t it be nice to get them for cheap? How about a penny?