I like making dirty textures to add to my photos, that is.
So, to get that perfect filthy, grungy texture layer I've been craving to add to my pics I took a piece of glass and smeared some gouache paint over it. Then I put the glass on a light box to get a source of light (so I don't have to use flash when photographing textures) and to create an illusion of textures being semi-transparent.

Here are some samples of textures I made. I won't use them all on photos, because some of them are, well, just too dirty, but maybe they will come in handy when working on some illustration or digital painting.
