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I've done banana, mocha (chic extra t and espresso), peppermint, vanilla, cherry....basically, if there's an extract, you can make it. I think using things like actual juice or fruit might be a disaster, unless it's just added as a glaze/topping
Hi- I've used liquors for other things, mainly my "ice cream" pies (just a Graham cracker or chocolate pie crust with flavored whipped cream that's frozen). I've found I have to add flavors as well as the liqueurs, because by the time you add enough liqueurs, the recipe is a mess. So, I imagine you should try a combination or the liquid / alcohol will keep the marshmallows from setting.