Change the people around for a day (April fools) On this day, Greenies become Donors/Skygods. Donors/Skygods become Mods and mods become Greenies. Just the Prefix though. The Mods (greenies) can still ban The other players.
I'd probably remove half the staff team, and replace them with deserving members. I'd kick one off the team every so often to cause a random sense of fear in the staff team. No one is safe.
I would Change the Server into a supercomputer. And thus consequently get rid of CLag, bring back the hoppers and Mob Arena.