Would it be weird with mint extract?
Hell no! I think that would taste great - oooh, I'll have to get some mint extract and give those a try.
They have no flavour of their own, just sugar, so I'm sure any flavour would work really well.
Yay! A marshmallow recipe made without corn syrup!
I've never seen corn syrup anywhere here in NZ, so none of our baked (or in this case, un-naked goods) contains any.