In reply to TobyA:
"Grass climbing" as the Poles call it is popular. They have some big routes climbed entirely on thick seams of frozen grass and moss. I've seen photos where it didn't even look wintery; no snow, just solid frozen turf.
I climbed with a Polish guy in Scotland years ago once and he was a big fan of turf, he had a huge rack of warthogs (which he acquired by swapping titanium screws) and was surprised I only had two.