I came across the Spectrum Optical Wired Mouse from Satechi and thought it was so cool that I had to share it. For $25 (regularly $30) you get a wired 1000 dpi optical mouse with scroll wheel.
The chrome appearance looks slick enough, but the cool part starts when you flick the switch on the bottom of the mouse to the On position. The bright LED lights inside the mouse cycle through blue, yellow, violet, turquoise, white, red, and green. To illuminate a single color, switch to the Lock position when the desired color is achieved. The LEDs can be turned off by switching to the Off position.
At $25, it’s worth grabbing one, if for no other reason than just to have around as a spare. I plan on getting one and setting it to blue to match the blue glow emanating from the USB hub on my desk.