title: Good way to procedurally generate a "blob" graphic in 2D
body: <p>I'm looking to create a "blob" in a computationally fast manner.  A blob here is defined as a collection of pixels that could be any shape, but all connected.  Examples:</p>
  
  <pre><code>.ooo....  
  ..oooo..  
  ....oo..  
  .oooooo.
  ..o..o..  
  
  ...ooooooooooooooooooo...  
  ..........oooo.......oo..  
  .....ooooooo..........o..  
  .....oo..................  
  
  
  ......ooooooo....  
  ...ooooooooooo...  
  ..oooooooooooooo.  
  ..ooooooooooooooo  
  ..oooooooooooo...  
  ...ooooooo.......  
  ....oooooooo.....  
  .....ooooo.......  
  .......oo........  
  </code></pre>
  
  <p>Where . is dead space and o is a marked pixel.  I only care about "binary" generation - a pixel is either ON or OFF.  So for instance these would look like some imaginary blob of ketchup or fictional bacterium or whatever organic substance.</p>
  
  <p>What kind of algorithm could achieve this?  I'm really at a loss</p>