GoldRush is a strategy game that is played with programs, suitable for events like hackathons or coding challenges. You create cities, recruit units and mine gold. Player with most gold after a given number of rounds wins. This is the only non-trivial game project I have ever finished.
I am currently exploring Castle Game Engine and learning image manipulation in Gimp and to a lesser extent 3D modelling in Blender.
I have a secret ongoing project which uses both Perl and Castle Game Engine, although finishing it isn't going to happen in the next decade.