Kate Davies just released a new sweater pattern (Boreal), and seeing it sparked a little search for other colorwork patterns featuring wintry trees. Just the thing for December - January knitting! Click here for the Ravelry search link.

Tuulia Salmela's beautiful Deep in the Forest mittens (fingering weight)

Winter Twilight mitts by Laura Rintala - the free pattern is here. Written for heavy laceweight cashmere but may be knitted in fingering weight. Be sure to check the projects pages on Ravelry - there are many lovely versions of these mitts.

Emily Elizabeth's Douglas Mittens (worsted weight).

and tree-patterned Pulse Warmers by Friederike Erbslein (free pattern). Fingering weight; pattern is in German but there are charts and with a little translation help you could figure out the numbers.

Kyllene by Kirsten Jensen, from Twist Collective - this one in fingering-weight yarn, with a keyhole neck.

The Elements earflap hat by Crystal Flanagan in worsted weight Lett-Lopi / Lite Lopi.

Meg White's Bosque hat, in bulky-weight Cascade Ecological Wool.

Happy winter!

edited to add: January 5, 2012

Nancy Bush's Spruce Forest shawl from the new Brooklyn Tweed collection, Wool People 2, in Loft (fingering weight)

Little Fair Isle Hat, free from the Purl Bee - ombré shaded trees in Koigu fingering-weight merino