Some of you further north may have already had a touch of frost this year, but as I went to my car yesterday evening and was forced to get the rough side of my squeegee out to remove the ice, it definitely felt like winter for the first time.
This macro image of frost shows us the crystallisation of water in amazing detail and is evocative of all things winter. This is another example of a great photo taken just up the road from where I'm sitting.
See shots like this, and others on a massive range of natural subjects at www.rspb-images.com.