You're talking about high end JUICES, right? And you want to know if anyone has been able to come up with recipes to copy those high end juices? Yes. They're called clone recipes.
You can do a search here on the forum, or you can do an internet search with the name of the juice you want to make and "clone recipe" and see what comes up. I've been making LOTS of "high end" juices of late, and I must say they're turning out very good, and I'm having a blast.
@poohbah seriously, it's this easy. Measure out your nic base and put it in your bottle. Measure out your flavors and put them in the bottle. Top up with VG and/or PG. Shake. This assumes you have a recipe in hand, but you can make a small sample bottle of something with no nic just to see how it tastes.
And look, here's a black licorice flavor:
Black Licorice-FW
One of the reviews says it's good at 10% so you could start there, and then add some menthol flavoring. If you want strong menthol, use around 5%, if you want very mild, use 2%, or anywhere in the middle.
And here's a menthol. I use this one and I like it, but there are others on that site.
Menthol - Cap
Just play, and surprise yourself with something yummy! It is SOOOOO EASY, especially with a recipe calculator, and there are several of those online. Most of the people here use EJuicemeup, I believe. I use a different one, but everyone seems to like EJuicemeup, so go for it.