Hi Ben,
I know you're fairly proficient with the propeller and shift registers. What I'd like to see is a use of large numbers of LEDs (>20) to create a light show. Maybe something using a swinging or spinning arm to do persistence of vision, A grid array or circle of LEDs to create patterns, or ideally an LED array that can take an input from a music source and create a windows media player style of effect which loosely corresponds to the music (eg more volume = more LEDs lit). I'm sure you know what I'm talking about.
I know what I have asked for is very broad so I guess my view request is to go nuts with LEDs.
Evilteddy