If you have an extra $40 dollars burning a hole in your wallet and around 10-15 minutes of free time, K.O Gadget Store has an awesome mod available that gives you a glowing back logo for your iPhone 4 and iPhone 4S.

The logo lights up whenever the front screen is turned on, and stays illuminated for 15 seconds after you put your iPhone to sleep. It even lights up when you're holding the phone up to your ear while on a call!

The mod is fairly easy to install based on the video instructions from their website, and the end results are pretty stellar. It's as easy as removing the 2 screw on the bottom of the iPhone using a Phillips #00 screwdriver, then sliding the back panel off by pressing up with your thumbs. Installing the illuminated logo is the only tricky part, but even those with little skill can accomplish the task.

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It's a great companion to your MacBook Pro, and they even include the required tools necessary to complete the installation. Check out the instructional video below!

UPDATE: Their site is currently down while they upgrade their servers to handle all the orders. If you manage to snag one, let us know!

Source: K.O Gadget Store