In reply to francoise:
I've been to Romsdal in summer, which isn't a lot of use for winter stuff, but you can see where the routes would form.
However, i would just go in winter. Some friends recently returned from Helmsedal (?), and the pictures are amazing - whole cliffs like a zebra crossing - white ice streak, rock, white ice streak......
I've gone icefall climbing in Canada where it is pretty amazing, but what i've seen is more impressive!