A project I've been working on in my spare time when I'm away from the Army...
I wanted to create something playable rather than a bunch of "engine" crap.
It's a sandboxy-rpgish-survival game.

AStar
Tiled Maps (I didn't create those tiles! Definitely from Zelda!)
[s]Super[/s] Simple map editing
Wandering NPCs(A*)
Fully scriptable NPCs via C# (compiled at run time)
Triggers. Again via C#


Things to add:
UI
Items
Iventory
Skills

Taken me about a week. Most of that was just playing the A* algorithm and getting it right.

Click here to view the iotd