I have a few ideas that I'm still in the very early stages of exploring/researching. I don't have a background in blockchain tech. So i'm still figuring everything out.

The first one would be aimed more towards businesses and researchers. But would essentially involve contracts that allowed for decentralised CPU/GPU processing. Something akin to BOINC but integrating the steem blockchain. I believe Gridcoin was trying to achieve this, and actually integrated with BOINC somewhat. I figure there would be quite a few people from the crypto community with GPUs they used for mining that are no longer profitable.

Second. I've just started to look into IPFS. It would be awesome if you could have a blockchain based service like twitch, where creators can livestream or post VODs that earn rewards(through people watching making micropayments for the content, like X steem per Y Seconds watched) and regular users could earn a fraction of that to host the content (storage/bandwidth fees) as an IPFS node, or perhaps other content in a similar way to Storj.
You could build out additional services/sites around the same kind of tech stack for hosting more youtube style content, or just other complimentary services such as eSports events/tournaments where users could contribute funds for prizes, or even gambling services if that's your thing.