Grape Drank by Ruthless E-Juice is meant to be like.. A "grape soda"/"grape Jolly Rancher" type vape. I've tried it, and it's definitely tasty, but I've heard some rumors being thrown around about high levels of AP in their entire line of e-liquid, so I try and stay away.
Before I was made aware of that point of concern, though, Swamp Thang was a go-to for me. Only good green apple e-liquid I've ever tried, and I've tried a lot of 'em.