I am a huge fan of black and white photography - as much as I like my colorful flower photos.
Winter is my favorite time of the year to think and create in black and white. There is already a lot of white (if there is snow!) and it is easy to focus on other elements like shapes, texture, lines, shadows, and interesting compositions. Remember to overexpose your images slightly, otherwise snow can look dull and grey.
Enjoy - Susanne