I found some more pictures.
have you ever seen these anywhere?
USB powered (5V DC) ultrasonic humidifiers may work. You can watch the humidity with a hygrometer and shut the humidifier when the chamber reaches the desired humidity. The water in the glass also helps to maintain the humidity inside.
wanted to ask you about these http://drymistat.com/ do you think these are the same crystals used in diapers and for plant pots?