Phone charging station
Basically a USB hub in a birdbox to make it look nicer. iPhones won't charge from it because they check the data lines to make sure they're connected to a computer, an official charger, or indeed one of the millions of knock-offs that followed Apple's pointless attempt to make the iPhone not charge from anything else.
Of course, the USB hub won't talk anything but 5v if a computer isn't plugged into it. Installing a miniITX board underneath the shelf would be overkill, right?