Did I hear a request for a thread just on grasses... ? ??? I'm sure I did! :D
I'll kick this off with an alpine-ish one (although, as you can see, I am just growing it in the border), Festuca gautieri syn. scoparia 'Pic Carlit'. This photo is old (2007), and the two plants are rather larger now. It's a very prickly grass... that and the nicely-rounded shapes always put me in mind of two big hedgehogs crouching beside the path!