For the last 48 hours I've been creating a game for the LD48. Ludum Dare announced the theme on Saturday morning (3 am here!) as "Escape".
With the theme Escape the first thing that came to mind was a platformer consisting of various levels with enemies to get past / kill, however when I started on developing it I quickly became bored with the idea and after looking at a couple of other projects people had announced I realised that it was being done by several people.
Instead of continuing with the platformer idea I opted to create something different, I enjoy making procedural enviroment's so I created a city algorithm that effectively created a maze which the engine then drew city buildings / decals and objects onto. On top of this it added guards and snipers to give the player something to fear while trying to find the exit (Which is randomly placed too!)