hey! nice idea to hold a contest like this! A possible theme idea which I think would be super cool could be a Night Time theme. So the screen in general would be dark blue/black and the top bar across could be again dark blue/black with bright stars and the place where in your Avocado Express Theme had the avocado you could have a full moon. It might be a cozy theme for the evening :D Upvoted and resteemed your post :)