Saw this little item on GreenMuze.  It looks great, and it’s conceivable it might just add a little humidity to an arid, small room.

The passive Mast Humidifier designed by Shin Okada is constructed from rot-resistant Japanese cypress.  The elegantly folded cypress absorbs water placed in the base and diffuses it into the room via the wood’s natural capillary action and evaporation.

6,300 Yen @ Japanese shopping site masuza.co.jp (be prepared to translate)