Whenever I need "Blueberry" this is my go-to mix.
MF Blueberry is the star and if I could only have one blueberry it would be this one. Use at 1% if using the PG based / Platinum version.
TFA Wild adds some, well, "wild". A touch of muskiness that blueberry needs.
FW Blueberry is my favorite "artificial" blueberry. Gives it a bit of pie filling bent.
The lemon is a punch of citrus that is needed to make blueberry pop. Any lemon will work, just a touch.

All three together give a full blueberry profile that I can throw on to anything - ice cream, custard, cheesecake, cobbler, muffin, cookie etc.

My favorite place for this is to just add 4% FA Forest Fruit. It's great in a pod.