Since I like to busy myself with astrology (just for fun, not because I actually believe in it), I'd appreciate the return of zodiac signs, even if they're purely decorative. But they don't have to be useless, I also have several ideas how they could be incorporated in a meaningful way:
- Traits. Only three selectable traits + one bonus trait related to the aspiration is too little for me, so a fifth trait could be added based on the sim's zodiac sign.
- Relationships. Whether they're platonic, romantic, sexual or anything else in nature, zodiac signs could make it easier or harder for certain couples to get and stay together.
- Predictions. Sims get the new option to read their horoscope - at their own risk, because whatever good or bad stuff the horoscope predicts may or may not come true depending on your sim's actions. There might even be a new skill related to astrology that allows you to study the stars and predict your own or another sim's fortune based on zodiac signs.
Personally, I'd love to see a combination of all these things, and I don't think it would be hard to do.