Here are three certificates which you can use for those special occassions in a geek's life. Just print them out, fill in the relevant information and hand them out. There, you've just made a geek's day.
Certificate of Participation for World of Warcraft Raid
For those poor souls who spent three hours on the raid, but didn't get any drops. At least they can have this certificate. (click image or here for pdf file)
Certificate of Blog Achievement
For the day when you get that front page link on a top site that just crushes your server. Congratulations! (click image or here for pdf file)
Certificate of Troll Excellence
Make the day of that annoying troll a little bit brighter. Who knows, maybe he'll reexamine his miserable life and stop starting flamewars. (click image or here for pdf file)