I previously recommended two types of coffee flavoring.: assuming you’re using one of those $20 grinders that grind three to four cups’ worth of beans, you could toss (into the grinder) four or five unopened cardamom pods, or a half dozen anise seeds. I now have two more recommendations. Break off a piece of nutmeg (a very strong flavor). Or add about a whole dollar’s worth of vanilla bean. (Sigh, that’s about an whole inch of bean.) The vanilla gives a creamy flavor with just a hint of vanilla taste, very nice.
I suspect the right thing to do with a vanilla bean is to use it to flavor sugar (add sugar to the bean for a month or two), but so far I lack the patience to try that.