So I've always entertained the idea of building a cluster with Raspberry Pi to tinker around with distributed computing, but I've never been able to figure out something to actually do with the cluster. So I'm looking for ideas of what to do with a cluster of Rasperry Pi's. Don't really know how many Pi's I would have in the cluster right now, if I find the whole project interesting enough I may throw a decent amount of money into it. Figuring I'd start with a cluster of about 5-10 Pi3's, and then scale up as needed.