This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
It happens all the time, you spend weeks and weeks turning your home into a monument to filth and pestilence, and then one day your mother comes to visit and you come home and it's like "Nooooo! My mess!". Well, now at least you can gaze longingly at the screen as The Defiler helps you relive your wonderful days of chaos and environmental neglect (Probably an exploding hamster involved in there too somewhere, hence the blood presets).
The Defiler takes any regular clean image and completely and utterly desecrates it by damaging and decaying the surface, and smearing it with just a hint of Unidentified Substance X or Human Byproduct Y for that oh so unfresh feel! Remember, when it absolutely positively has to look pretty bad, trust The Defiler!!
defile filth dirt melt grime mess old age blood guts slime moss oil lava violence chaos ruin surface smear splatter exploding hamster zephos