For a project called Tag Clouds, street artist Mathieu Tremblin paints over graffiti tags and makes them more legible. The result looks like when Word says that the Hardkaze and Aerosol fonts are used in the document you're trying to open but are missing from your computer and you click OK to replace them with whatever's available. I think the font above is Arial, which is perfect. I also like this faux-watermark piece he did:
