Deck the halls your backgrounds with festive lights and hints of snow. This LORA is for all wintery-vibes and is not tied to any holiday specifically. It can even be used for other seasons but you may need to negative prompt snow, winter, etc.
Overall, this LORA will up the background festiveness without any trigger words, but you can up the holiday factor by adding Christmas tree, Christmas lights, snow, night sky, sparkle, bokeh, etc. It will not work on images that specify having a blank white background.
You may find that people generated with the LORA seem to favour facing the left side. Use of control net or emphasizing the character's position will overcome this.
Trained on 1.5 anime.