Who has a good recommendation for a nice one?
It doesn't have to be super sweet over the top in your face.
I'd like it to be an "adult" level of fruitiness.
SweetCakes has the most amazing, straight-up, true-smelling blueberry FO. It really, truly smells just like fresh blueberries. I've never soaped it, though, so I can't say for sure if it would morph in soap over time or not.
Elements Bath and Body has a really nice Blueberry Lemon Verbena FO that sells very well for me. The lemon compliments the blueberry without overpowering it.