Don't want to be thinking about next winter just yet but I love the Marc by Marc Jacobs collection. I'll post a few others I like from different collections.
I bought this new 'nail glitter' by GOSH, you can get it in gold, silver and pink I think! It's a bit messy, as you would expect with any sort of glitter, but looks so cute! Sorry for the bad photos and messily painted nails.
From H&M, one tip though! paint the insides of any cheap ring that isnt real silver or whatever, with clear nail polish, its stops your fingers going green!