The thing I like best about this idea is that you can easily customize it to fit your particular sense of smell!
For my potpourri, I combined whole cloves, cinnamon sticks, an orange, and a bit of ground nutmeg and ground all-spice in a small pot of water on the stove. I then let the mixture simmer on the stove for a delicious smell! This is also a great idea to do if you're having company, or hosting a party and want the house to smell nice!
*I looked at the whole cloves on the spice aisle and they cost close to $6.00, which was not in my budget. I recommend looking at the selection of "El Club Mexicano" bags of spices-just a few feet away at Wal-Mart (at least at ours!) These bags were a dollar or less each, and I was able to buy the cinnamon in a bag too.
**You should be able to leave your potpourri on the stove for a day or two, and turn the burner back to simmer when you're ready for more smell!