I just ran across this very cool sounding add-on via Guerrilla Innovation.
The idea is similar to Ad-Block, except that instead of simply eliminating the ads, this Firefox extension will replace advertising with images from a collection of contemporary art. The extension will be backed by a program of curators and regular art "exhibits" that happen every couple of weeks.
What a fantastic idea!
i've would never expect to see this "So, the more ads you surf, the more art you'll get!" really cool idea.