I have several tealight candle holders. And I mean, several. I can buy scented ones, which I do, but they are sometimes surprisingly pricey for such little candles. So I like to make my own.
The process is ridiculously simple. I take unscented tealights and place them on a candle warmer. You know, those plug in burners that you place jarred candles on. They look like this:
I can get about 3 tealights on at a time. Warm them until they have completely melted. Lift them off the warmer, CAREFULLY, and sprinkle in your herbs of choice. Let them cool, and voila! Scented tealights!