A list of bitmaps that are interesting when loaded as balls.  These
files should be in /usr/include/X11/bitmaps:

  2x2
  boxes
  cntr_ptr
  cross_weave
  dot
  keyboard16
  left_ptr
  right_ptr
  scales
  sipb
  star
  target
  xlogo11
  xlogo16
  xlogo32
