This is a DreamArtist Textual Inversion Style Embedding trained on images of a snowy winter forest/cabin scene. You can get amazing winter colors and snow effects in your images by calling Style-Winter in the positive prompt, and if you want to temper the effect, also call Style-Winter-neg in the negative prompt.
Note: SD 2.x version here!
If you'd like the effect to come through stronger (some models need it), try bumping up the emphasis on Style-Winter - see the prompts in the images below.
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Props to Elldreth for the many hours spent figuring this all out with me! Go check his models.