This site offers a tool that works in similar fashion to Photoshop and can be used to airbrush billboards out of Times Square.

Flo Heiss: “I watched a piece of footage the other day of Jimi Hendrix performing Foxy Lady to a small audience, I think it was in
Hawaii, can’t remember. I had never seen this before and I couldn’t quite work out what it was that made the footage so powerful.
Only after stumbling across this project did it dawn on me: it’s the absence of type and festival advertising that makes the clip so
watchable (Jimi’s beautiful performance aside, of course). Now imagine Times Square without any ads. Boom!!!”