My case modding idea is for all you lovely science nerds (myself include)!
The case is represented with a theme from the CERN experiments. This means a frame which is typically octagonal with a metal/wiring theme in grey/black/blue.
The circular port in the back can be used as the main power input and each angular section can be used as an open port for things such as DVI/USB/ETC.
The front circular port can be used as the main power button/power display. USB ports can be added in front along with optional video/sound inputs.
This of course is down to scale, not actual CERN sized :P