Japanese designers have a knack for creating the most adorable humidifiers, and the Chokotto Oasis paper humidifier is no exception. It doesn't need batteries -- simply pour water into a small tank, and it blooms open like a tulip in spring.
It's pretty small, and it weighs just 100g, so you can simply set it on your desk when you need it. When you don't need it, you can just shut it and throw it in your bag or your drawer. JapanTrendShop sells the cute little contraption for around $22. It's sort of like investing in an bouquet of flowers -- that bloom anytime you want.