I like to make ice cream. The oddest flavor I ever made personally was Hops ice cream. I had an especially good crop of Cascade hops and decided to make some ice cream.
You have to be a fan of finishing hops to like it but it was not bad.
Two summers ago, I made elderberry flower cordial. IMO, it would make a lovely ice cream. I did make a sorbet with some of it and it was delightful. There are elderberry flower syrup recipes online, if it interests you.
I know I would like a hop-vanilla ice cream. The bitterness of the hops would go well with the sweetness of the ice cream.