get in touch with @paulag, she's really into the steem blockchain data, she'll probably like data visualization very much

maybe talk with @arcange, who set up a public Steem SQL data server

take a look at what's available at steemtools.com (there's a section on data there) - that will also show the steemian that made the tool

Talk with a few data people on steem that you found via steemtools (via steemit.chat or discord), if they like the idea, just make a post with #dataisbeautiful tag and you're off!

Good luck!

(oh and if I say things that aren't clear or you have more questions, feel free to contact anytime)