Scavenger HUNT hack

My members are looking for something else to do on the forums. So i had this ideaof a scavenger hunt hack.

In this hack basically you make an image that your members need to find. An image or a link or anything. This hack would place that image somewhere in your board.. could be in a post.. could be in the FAQ.. basically anywhere. The first person who finds the item and clicks it wins the hunt. When they click it an Admin is told via PM or Email, and possibly a thread is automatically created in a specific forum that tells of te winner.

Is this too out there or is it not totally fun.. I would think this would be really fun on boards. I have been doing it manually but i think an automated system would be MUCH easier.