I have a cool idea for some design work I'm doing right now, and I was originally looking for an Adobe Illustrator or Inkscape solution, but it seems I may need to turn to processing.  What I need is a circle filling algorithm.  Basically, I need to take an input bitmap(or vector) and fill spaces with closely-packed circles.  Something like an apollonian gasket.  Has anybody worked this out?  Can any existing libraries help me out here?