Mixed media folks or anybody who needs to play around with the look of their letters might be interested in taking a look at FontStruct, a free online font-building tool.
FontStruct allows you to create fonts constructed out of geometrical shapes, which are arranged in a grid pattern, like tiles or bricks.
FontStruct also allows users to generate high-quality TrueType fonts, ready to use in any Mac or Windows application, from the original designs that they create. Many users also allow their creations to be shared through the FontStruct site.