There’s an interesting post on “Visualising English Word Origins” from Ideas Illustrated, which colour codes words according to their origins and then uses this process to analyse texts.

If you scroll down through the comments section, you’ll find links to sites where you can run a similar process  to the one the author describes on your own texts.  This was originally spotted via the Johnson Blog at The Economist.

In a similar vein, the Voxy infographic below takes a quick look at where English gets some of its constituent parts – thanks to @yya2 on twitter for spotting that.