Build it up to break it down again

So my girlfriend really loves halloween, and I love her, so I made her a tiny jack-o-lantern with a usb light. Super simple, I just cut an old usb cable up, pulled out the red and black wires, used a LED resistor calculator (usb provided 5v) Then I soldered in the resistor, heat shrunk it all up, and plugged 'er in!