Answer:
You should do a christmas theme.
Step-by-step explanation:
maybe add a small christmas tree on a desk or in the corner of your room. if you buy ornaments you should use some sparkly ones, snowflake ones, and anything that looks festive. and get some lights to put on it too. maybe add some christmas lights on your walls. the color theme of the things you should get for your room should be red, gold, white, and maybe silver, even a nice green. maybe buy a christmas decorative pillow for your bed. buy a scented candle like cinnamon, vanilla, sugar cookie, peppermint, or a candle that says something related to christmas like candy canes so you can set the mood of festivity in your room.
I hope this gave you some inspiration :)