Since you using smart contracts it means you can make some good features on backend.
So, currently is football championship going in Russia, if teoreticaly Geo was had released app today would be a great feauture to attach national country flags to dropped coins.
E.g. one portugalian drop GeoCoin in Russia, but he want to attach portugalian flag to it to promote his country footbal team or something like that. I hope i could explain my idea properly. Or event atach any other images to each point like in agar.io. It would be very fun for all.