Stauf Puzzle (Painting Gallery)

There's really no way to give a straight solution to this puzzle, since
the initial conditions are randomly generated.

This puzzle is very similar to the crypt puzzle.  If you remember how you
finished the crypt puzzle, you may want to apply your strategies from that
puzzle to this one.

I found that it was best to work one square or group of squares at a time
at the start of the puzzle, until I reached some kind of recognizable pattern
or order to the colors of the squares.  Trial and error is the only real
strategy here, at least when you start out.