One idea I've been kicking around for a while, which seems to have been done a few times (but not quite like how I would do it) is the idea of a crypto raffle.
I bought rafld.com, rafld.net, rafld.org and raflcoin.com (rafld = raffled) a few months back, but put it on hold when to my dismay, a day after registering the names, I found out about the RAFL ICO coming out
That's since come and gone, and it seems like they did a piss poor job, leaving room for someone like myself (and hopefully a few other people) to come in and do it correctly.
The world is screaming for a decentralized raffle system that's not geared strictly towards just local, small p2p raffles, but also towards larger charitable organizations and businesses, even churches.
If we could get a quality site put together with a companion ios/android app combo so that people & companies could register, setup, and then run provably fair raffles at anytime for any amount of people, using our app, and a maybe say a qr code system or nfc system, I think it'd be awesome.
Setup a few large clients to use our system for the raffles they already run (as well as the smaller p2p raffles where people could raffle their own personal items off, with a personalized landing page similar to a gofundme page, but more fun), and I think we'd have a winner.
I also own a bunch of supporting raffle domain names, like bitcoinraffle.org, etc.
Anyone interested?