How we went about it on my old board is that every month, there'd be a new challenge. People would have the first three weeks to turn their submissions in, and the last week, submissions would be posted anonymously and board members would vote for which submission they thought was the best. One board member would keep track of the votes (they wouldn't be able to participate in the current challenge, obviously), and at the end of the month, they'd announce the winner, and the winner would get some kind of award thingy. It's pretty fun and it keeps the creative juices flowing, as long as more than two people enter a challenge. *lol*