I'm actually really fond of the Green and Lovely sets, mostly because I love green and I'm recently getting in touch w/ my girly side. Modern Wood also looks very nice. I don't really have any more favorite sets.
I think mermaid is one of the best its so creative! the only thing that would make it 50x better was if it was customisable, if it was it would probs be the most popular set for girl tbf