I have never liked "New Year, New You" book displays. Self improvement does not need to have an implicit or explicit aura of self-hatred. Save the diet books and exercise videos for another day.
Instead, focus on showing patrons how they can "____ something new." They can learn something new, eat something new, make something new! It's a way to showcase some of your non-fiction collection that needs more exposure as well as helping them find something new to focus on. I have some pictures here that showcase a few of the displays I have done in the past.
It would also serve patrons who don't celebrate those particular winter holidays.
Top 10 World Building Fantasy Novels/Chicago Public Library