There was a scene in the 2009 "Virtuality" TV pilot about that also. You can see it on this video, great use of VR :

http://www.criticalcommons.org/Members/Dethklok/clips/Virtuality%20Painting%202.mov/view

VR game ideas brainstorming :
http://www.mtbs3d.com/phpBB/viewtopic.php?p=92672#p92672

Virtual_Painting.jpg

http://graphics.cs.brown.edu/research/sciviz/cavepainting/cavepainting.html

VRPaint (and VRBrowser) (crosspost from OculusRift.com) : http://www.mtbs3d.com/phpBB/viewtopic.php?f=140&t=16398