From Cottonwood Software:
A photo slideshow screen saver with beautiful photos of a museum gem and mineral exhibit. All photos are 800x600 high-quality images taken at the Cullen House of Gems and Minerals in Houston's Museum of Natural History. (1024x768 also available, see our web site.) Other screen saver features include transition effects, black and white mode, password use, and extract photos as wallpaper, including built-in wallpaper cycling every hour or every day.