Disclaimer: I'm not sure what the duration of these things is gonna be, but for now they smell awfully good!
oranges (get the cheapest you can find - $2.50 at Wal-Mart for these)
cloves (super-sized courtesy of BJ's)
thumb tacks or push pins (what is the difference?)
band-aids (unless you aren't as wimpy as me)
The band aids help push in the cloves. Use the push pin to make holes for the cloves. I found that three holes was my max before I lost sight of the holes amongst the orange dimples. Make different designs - mine were not as fancy as some I've seen...or make a smiley face like Lulu did!Bonus: On chilly days, I like to simmer (bring to a soft boil first) a large pot of water with one orange sliced into rings, add some cloves, a bay leaf, a shake of cinnamon, nutmeg or allspice. Your house will smell like you've been baking all day! A lovely treat without a lot of work.
*WARNING: Be sure to keep an eye on your pot. You can add water if it gets low, but eventually you'll be able to tell that you've gotten all the oomph from your spices that your going to get.