I like mine plain, but I always add a bit of sugar for DH.
I've added different flavors like lemon or lime for different desserts. Oh, and I once threw some cream and sugar in a saucepan and added some coffee beans. I brought it up to temp to let the coffee flavor soak in. Then I cooled it and made whipped cream from that. I don't remember what I used it for, but I remember it was a big hit.