With just one coat, IdeaPaint turns any surface into a dry-erase board.

The benefit--besides being able to brainstorm on almost every inch of your office--is that the paint is half the cost of whiteboard and better-performing--you can leave marks up indefinitely, and they won't stain the wall. Of course, it takes a bit of time--you may have to sand the wall and prime it--but one other benefit is that you're not incurring all the carbon involved in manufacturing and shipping a whiteboard.

Source: Fastcompany.com