usb powered cathodes/lights: do they exist?

[ironman]

Basically I have a load of cathodes that aren't being used at the moment, would be nice to use them but I need them to be powered via a usb connection, is this possible and are there any lights available with usb powered connections?

 

[Borden]

Antec do external usb powered cathodes. I have a pair of mini ones (about 2" long). They can be either on, off or sound activated. The details of the full size ones are here

I don't know how/if you'd be able to modify internal cathodes to be powered via usb

 

[Day03]

I think that USB port gives off 5V while the normal cathode connects to a 12v molex so don't know if it's possible to modify it. Better probably to buy one already made for 5V.