Clojure is an exception to the number of lexical types found in most Lisps, note. Scheme doesn't highlight nearly as nicely.

Now please explain blurb/nth-blurb :)

That's code for a fancy loading screen, which animates some svg thing and also shows a couple happy messages (aka blurbs.)

I would really like to read the rest of the source of whatever that application is.

Are you using Reagent?

I am using reagent and re-frame. Sadly the codebase is closed source. :(

OMG! How do I do that? Mind sharing your configuration?

Sure, I use emacs prelude. I think you can get the same results here if you just use prelude + the amazing theme called moe. My emacs config (which is to be used inside/ontop of prelude) is at https://github.com/escherize/prelude-dotemacs

loved the rainbow brackets on that, it must be so useful to see where they match up with colour.

It is! Also when your cursor is on a paren, the text editor lights up its partner: http://take.ms/PJS1p