Hacks, Ive been running a monthly competition on my forum taking photos from the gallery and getting members to add funny captions. I do it very awkwardly being a dumbo by selecting the photo manually and placing it on the home page (TP) with an email link for their caption. At the end of the month i manually collate them and place them in a poll for voting.
Maybe this might spark some interest to your users and myself by an automated system for such a competition. What do u think?