I've heard of a chamomile lawn, indeed I've tried to grow one several times, with limited success it has to be said, but how about a lettuce lawn? This bit of grass is where the Hubbard table chickens lived, and where they consumed many bolted lettuces, and that's possibly the reason for this patch of Green Salad Bown growing in the middle of the grass. Come to think of it, the bolted lettuces were overgrown, but I doubt whether many had had chance to set seed, so maybe it just blew in from the veg patch. I bet I couldn't grow lettuce here if I tried.
It's growing really well though, so as I said before, if things just come up I like to leave them, extra pickings of salad for free. Watch out for Mr Wilkinson coming along on his lawn mower though!