Check this out from Cooljag USA

http://www.cooljagusa.com/miniflash.html

A PC fan that can display messages as its propeller
rotates. You can program the fan with your own custom message with up to 128 characters.  It is available in the following configurations:

80 X 80 X 25 mm 1700RPM 23 CFM
90 X 90X 25 mm 1400 RPM 28 CFM
120 X 120 X 25 mm 1100 RPM 49 CFM

On the thread http://www.electronicslab.ph/forum/index.php?topic=976.0 entitled “How many amps can the telephone line supply?”. It was demonstrated by our member “Born2BeWired” that we can actually use the phone line as a power source for LEDs. The telephone company has an independent power source which in most cases more reliable than our power company. This is specially true when we are talking about electric cooperatives operating in the province. Just in case we have brownouts, we could take advantage of the electric current supplied by the phone company and use it to power our white LEDs.

Here are the pictures and schematics:

Yes it works and it is called phototherapy. Acne is caused by the inflammation of the oil gland as a result of blocked pores and bacterial infection. The bacteria responsible for acne can be killed by exposing the skin to blue light coming from an LED with a wavlength of 405nm-420nm. To hasten the healing of an infected oil gland, the skin is exposed to red light with a wavelength of 655nm-665nm ( Red ). The combination of blue and red light exposure helps in the reduction of pimple size and redness. Phototherapy study is published under the British Journal of Dermatology 142 (5), 973–978 and on the Mount Sinai School of Medicine under David Goldberg.