Awesome! will contact a few people who may do it, it's an awesome idea something to relate to and create a sense of belongingness among the community.In addition it will also give a unique identity to the community. Now the point regarding rewards, think its a good motivation to convert this into a chalenge as such and select top ten basd on commnity voting. Higher votes allows us to select the banner. How the reward is to be paid, that i think you guys are good to decide.
My two cents!!!
Cheers!!!