Drawing on the walls

From Colossal, two different approaches to getting rid of those boring, blank walls.

Scribit: the programmable robot that draws on walls (on purpose)
Invented by MIT Professor Carlo Ratti, the Scribit is a new robot drawing machine that creates text and images using erasable inks. The project’s creators bill it as a useful tool in work environments as well as an easy and interchangeable way to decorate one’s home.

Reminds me of that turtle from years ago. But perhaps you want something with a little more artistic pretentiousness?

A gigantic helium-filled and charcoal-studded sphere covers rooms with unpredictable designs
The artist describes ADA in a statement: “The globe put in action fabricates a composition of lines and points, which remain incalculable in their intensity, expression, and form however hard the visitor tries to control ADA, to drive her, to domesticate her. Whatever he tries out, he would notice very soon, that ADA is an independent performer, studding the originally white walls with drawings and signs.”