I have this bottle of old perfume that I no longer use and is most likely expired, but it is still very fragrant. So I simply popped off the top, stuck a few rattan sticks inside, and turned it into a diffuser.
|Now my room smells really nice!|
If the neck of the perfume bottle is too narrow to hold diffuser sticks, or if the neck is too wide that you're worried the scent will dissipate too quickly, try funneling the perfume into a more appropriate container.
If you don't have any old perfume you can use to freshen your room, try making your own reed diffuser.