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Picture of How to make a USB to light up an LED using Bare conductive paint pen
What you need:

Bare Paint Pen
Pen/Pencil
LED
Cardboard
Ruler
Scissors
USB port

Optional:
Heat Gun (if you’re impatient)
Hot glue gun (if you don’t have thick cardboard)

Step 1:

Picture of
Take a piece of cardboard large enough to draw 2 lines 12 mm wide and 75 mm long.
 
AWESOME!