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I have an educational site running on my cluster of 6 Pi 2s in my basement: http://www.pidramble.com/

Code, tutorial, parts list, etc. here: https://github.com/geerlingguy/raspberry-pi-dramble

Matthew Saunders also designed a very nice cluster stack.

https://learnaddict.com/2015/08/03/raspberry-pi-stack-a-plat...

I always thought the cassandra multi datacenter cluster on rpis was interesting.

http://www.datastax.com/dev/blog/32-node-raspberry-pi-cassan...