Scent your room with your favourite perfume/cologne simply using the warmth of a light bulb.
Make sure the lightbulb in the room you want to scent is completely cold. This means your lightbulb must be off and cold to the touch, otherwise this gets dangerous as your lightbulb will explode.
Simply spray a little of the perfume onto the lightbulb or drop a couple of drops onto the top of it. Let it dry for a few minutes and then turn your light on. The warmth from the lightbulb will heat the perfume/cologne and scent your room. No need to buy any plug-ins anymore. Just please be really careful that your lightbulb is cold before you add the scent.