I've started a new series of drawings involving staining and burning paper. So far, I've used coffee, red wine, and paper burning with a heat gun. After the stains/burns dry/cool, I draw on top of them with ink and white charcoal. You should try it, too, as it's fun to see what weird structures appear. My plan is to have 8-10 of these weirdos to hang somewhere in town. We'll see.
Fossilized Apoptosis - coffee stain
Interterrestrial Architecture - red wine & heat gun
Detritus - heat gun