I cannot give you my full recipe, as I currently don't know where it is, buried beneath a pile of useless junk in a drawer in my bedroom, for sure. But one of the very 1st DIY e-liquids that I personally made & personally enjoyed so-much-so that I wound-up vaping it every day for months & months & months, was a little Keylime Pie flavored juice that's foolproof to make & a delight to vape.
All it takes is a little Keylime flavoring, Graham-cracker Crust, & a little Crisp. I'm sure you can substitute Crisp for menthol or some type of mint/menthol flavoring. (use whatever you think would do well) You wind-up with a very refreshing Keylime Pie vape that you can suck-on til' the cows come home & never get bored of it. At-least, I never really got bored of it when I was into it, & into the DIY scene. Unfortunately I'm stuck on pre-mixed for now, as all of my DIY supplies were given to friends starting their vape journeys, and some of the supplies just downright got nasty. (juice leaked, flavorings spilled in my flavorings drawer, and most of my blunt-tip measuring syringes and mixing cylinders were given-away, while the rest of them lost their measurement markings to the e-liquid spills.
But yeah, mix away with ye! I promise you'll enjoy it if you do! It's foolproof in that it's very easy to make, almost any percentages of the above flavorings will do- and it's foolproof in that it'll satisfy almost any vaper, including bakery nuts, candy nuts, and fruit nuts!! It's a great vape indeed! Enjoy...