Does anybody use these Detail Textures? They act as an overlay, that appears over the texture it is applied to. I recently started experimenting with these and I have to say, they can greatly improve the detail and 'grittyness' or surfaces. Downside is, AFAIK they can't be added from placed textures, and have to be changed in the texture packages, which also means all textures in the map will use the detail texture.