If you don't want to end up with boredom, you should at least change the type of contest each month. Not everyone is good at copying images, others ,especially those new to vue, aren't that good at creating usefull stuff. You could easily end up with a challenge for the few very good vuers, if you understand what I mean. And new vuers are left out in the dark. I am working on a picture, but the school eats up the days ;)