I recently remembered that there used to be a nice plugin for SIMBL that’ll put e.g. TextMate into full screen mode. Something TextMate itself doesn’t support out of the box, but that comes in handy to reduce distractions while working with it.
Instead of disco balls, the 100th todo list application (I’m using OmniFocus, thank you very much) a coin flipper (just use a quarter, will ya?) or a face melter, how about something useful for a change?