A device typically adapted for association with an air diffuser of a ventilation system of a dwelling. The device redirects an air stream from a forced air column received through the diffuser. A novelty item is disposed to depend from structure associated with the base for rotation of the novelty item by the air stream. An operable suspension system includes a magnet assembly and a magnetically attracted bearing element. Desirably, a safety catch is included to maintain the novelty item in proximity to the base in the event of decoupling between the magnet assembly and the bearing element. One preferred base is adapted to form a slip-on fit to a diffuser register of a dwelling's ventilation system. Certain novelty items are sized to provide a self-packaging capability for commercial display. An alternative base is structured to look like furniture, and may include a plurality of internal passageways through which air may selectively be directed. Certain bases may contain a scent source to impart a fragrance to the air discharged therefrom.