I did a lot of experimenting at the beginning to find a set of paint mixes I could use to shade/highlight black, and I'm happy with how it turned out. The bases are 'Urban Streets' bases from Secret Weapon Miniatures. I added ice using crackle paint followed by some snow patches using baking soda mixed with white paint and glue (my first attempt at this technique, I like how it came out).
Along with the squad, I also painted up a Ravenwing librarian. The model is mostly made of pieces from the Black Knights sprues, with a few pieces from the Dark Angels command squad set (torso front, book). The bolters were taken from a standard space marine bike and carved down to fit, and I sculpted the psychic hood from green stuff. I also free-handed a ram skull Librarius icon on the shoulderpad.
Anyway, here are some more pictures of models from the squad. Enjoy!