I saw this idea in a magazine awhile back and finally got around to trying it and it is amazing! I can smell it as soon as I walk into my home and it was very inexpensive.
I found this hurricane candle holder at my love, THE GW (Goodwill, lol) and filled it with whole coffee beans. I chose a roasty Vanilla flavor. They had some interesting ones to choose from, even a dark raspberry vanilla..yummmm wonder what that smells like. Then, I just positioned a flameless candle into the beans. Just the coffee beans sitting there smell incredible, but I bet if you actually lit a candle, the heat would intensify the smell.
Man, I want a latte now.
I think it would be super pretty with a lower, more open holder, as well. Like a candle bowl or dish.