Pebbles, by Jonathan Hunt
Click for a 3600 x 2700 pixel version.
Here is a povray scene written by Jonathan Hunt. At is an amazing example
with absolutely no external textures and only a few hundred lines of povray code.
The rendering took however 3 days on my office machine (doing all kind of other
chores too). Quite nicely solved is also the problem of no overlap.
Povray is of course a full Turing complete language which can solve all kind of
tasks, here, they have to solve a non-intersection problem, which is quite hard
as the shapes are not just spheres.