While we are naming stoner flavors... I mean uh... just flavors that come to mind. I wanna say I love the red velvet cake idea.
Peanut butter and jelly (because peanut butter and blueberries make me think of this every time I eat some)
Blueberry banana
I'm thinking a coconut flavor may be good with oats. BTW, I put oatmeal in my protein shake every time, so, it can change how you think of a flavor.
I dunno, I think everyone has listed every good idea known to man.