I am fairly green as far as chemicals in my home go. The one thing I do like to do, however, is burn tarts in a tart burner. I can choose the scent depending on the season or my mood. But, tarts are expensive (especially if you are a Yankee Candle snob like I am-- but face it, they do smell the best).
I've learned (thanks to my sister) to save a bit of money by not buying the tarts that are specifically made for tart burners. Instead, I purchase votives (which cost as much as tarts) and cut them in half!
Remove the packaging and pull out the wick and the wick holder (you don't really even have to do that.. it just looks weird) and light your tea light!
Usually Yankee Candle has a sale on votives at least a couple times a year. I just bought up a bunch for 6 for $5 and I have votives, er, tarts for weeks!
PS- Read up here on how to easily remove the wax from your tart burner!