I may have asked this before, but what are some good ways to create 2D 
textures that tile? A tiling desktop background is a common (maybe not 
so much these days...) example.

Secondly (and this is the more advanced part), how might I turn tiling 
on and off for a particular direction? What I really want to do is 
create square terrain tiles (for a game) that have 16 possible "states" 
based on whether or not a tile has a neighbor.

For example, a tile with four neighbors would join nicely on all four 
sides. A tile with only three neighbors would be "closed" on one side.

Here's are the 16 possible "states":

   o        o        x        x
o o o    x o o    o o o    x o o
   o        o        o        o


   o        o        x        x
o o x    x o x    o o x    x o x
   o        o        o        x


   o        o        x        x
o o o    x o o    o o o    x o o
   x        x        x        x


   o        o        x        x
o o x    x o x    o o x    x o x
   x        x        x        x

The "o" in the middle of each diagram is the tile in the center. The 
rest are its neighbors.

-Mike

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