Alright Mibbians, I need help with a youtube contest I am holding.

I'm going to be holding a contest on youtube dedicated to the environment.

What I'm asking is that youtubers post a video response to my contest video I am going to make of themselves recycling anything that can be recycled and listing how many cans, newspapers, bottles, etc. etc. that they recycled. The person to get the most objects recycled wins.

And that's the problem. I don't know what they win. So do you guys have any ideas?
I can't say cash or anything that has to be mailed in because, as you may know, I am only thirteen. So...any ideas for the prize and any improvements for the contest?