Well, you wanted it, and here it is. A St. Patrick's Day signature event. Here's how it works. All you have to do is make a new signature, one with a lot of green in it, and submit it in this thread.
Then, after you see another entry you like, edit your post to include which other entry you're voting for. Only 1 entry per participant, only 1 vote per person, and only votes from participants will be counted.
After a week, the entries with the most votes will be declared the winners, and will each receive 50,000 SP. Good luck, and be creative!