My Idea:

We can create a chat channel for this purpose called Steemit chat contest channel!

Then introduce a picture for MEME at the beginning of each week in the said channel, every contestant will send link of their work back to the channel with a hashtag 'steemitchat-contest' in which the person that comes up with more up votes at the end of the week emerges a winner.

Thanks @firepower for this wonderful opportunity for steemians to have more fun.