We keep a stick of Palo Santo on top of the toilet tank the way that some people do with scented candles. See, we don't have a fan to dissipate any, well, let's say, negative bathroom odors. That's where the Palo Santo comes in.
Palo Santo (or Holy Stick) is such a resinous and aromatic wood. Just a quick touch of flame will bring the pungent oils oozing to the surface. We don't burn our Palo Santo like incense--it doesn't catch and keep burning down to ashes. We just run a flame over it and--boom--instantly the room smells magnificent.