From here on you can also start to prototype your own server farms, like these two projects:

https://cloudant.com/blog/building-a-cloudant-cluster-of-raspberry-pis/
http://www.datastax.com/dev/blog/32-node-raspberry-pi-cassandra-cluster
https://www.raspberrypi.org/blog/serving-raspberry-pi-3-launch-raspberry-pi-3/