Hey, I just signed up for this on my path to an early promotion and white-listing. In case you don't see my 3 suggestions on the MC Forums, here they are:
1. We should have clan wars! Even though this is an Anti-Griefer clan, clan wars are extremely fun.
2. I agree with AznAran. We should have parties in Skype or Ventrilo (or even Teamspeak) in which we get 4 or 5 people onto a server and do a custom map.
3. Random Griefer Patrols. We could ally up with the top ten or so Minecraft servers and randomly send people on one of them to see if there are any Griefers. I used to be on the BloodCraft server a lot, and there is SOOOOOO much griefing.