Essential oil reed diffusers are easy to buy, but they’re just as easy to craft. Start with a small, short glass jar with a narrow opening at the top like a spice jar. (Alternatively, a small and narrow vase can also do the trick.) Fill the glass with ¼ cup safflower oil and a few drops of any essential oil, then arrange a handful of reeds through the narrow opening in the top. The wooden reeds will soak up the liquid at one end and disperse sweet smells from the other.
Shorten the work one step more and skip the jar: You can just dab a few drops of oil onto a lamp's light bulb (one that's cool and completely off) so that when you turn the light on, it heats the oil and doubles as a diffuser.