We've been noticing some pretty clever 'reverse graffiti' around our city, where artists (or businesses) have taken a stencil to the filthy concrete and power washed an image (or ad*) onto the ground, making for a design that is lighter than the surrounding area. This Grime Writer ($13) works along the same lines - instead of tagging something in a destructive way, you can just fill this pen with soapy water and clean your design on existing filth. If someone really doesn't want it there, instead of repainting a wall, they have to put some elbow grease in and get to cleaning, which can't be a bad thing.
*Classic corporate America, co-opting graffiti for commercial purposes.
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