I finally found an article with very good examples of infrared photography.
When these infrared filters are used together with infrared-sensitive film or sensors, very interesting “in-camera effects” can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the “Wood Effect.”
The [...]

digg_url = ‘http://www.photoaxe.com/how-to-make-your-own-photography-filters/’;

Yes, I’m serious, this it’s not a joke. You can build filters for your camera (either digital or film).
And yes, it’s incredible easy.
• homemade infrared filter: a piece of developed unexposed slide film OR a floppy disk !
• homemade blue filter: a piece of exposed developed slide film with methyl blue
• homemade yellow filter: a piece [...]

An infrared filter is a filter to remove visible light and only pass infrared light in different wavelengths.
Here are some types of IR filter to choose from:
• The Kodak Wratten 87, 87A, 87B, 87C (87 starting at 750nm, 87C at 800nm, 87B at 850nm, 87A at 950nm)
• The Hoya R72 (High quality filter starting at 720nm, [...]