Dappled tiling
  We consider a certain tiling problem of a planar region in which there are no long horizontal or vertical strips consisting of copies of the same tile. Intuitively speaking, we would like to create a dappled pattern with two or more kinds of tiles. We give an efficient algorithm to turn any tiling into one satisfying the condition, and discuss its applications in texturing. 
Shizuo Kaji, Alexandre Derouet-Jourdan, Hiroyuki Ochiai
cs.DM cs.GR