Potpourri can be made from a variety of great smelling things. Take rose petals (or any other great smelling flower petals), maybe some citrus peels, or even spices such as bay, oregano, thyme, and lavender. Dry for a few days on a rack or in a LOW oven for an hour or so. Toss in bowl and start breathing. You can basically dry anything that smells good and combine smelly stuff together.