A small lamp i built a few days ago that only took a couple of hours to make. I just used a few parts i found around the house. It's pretty effective for it's size. A cool addition to the desk.
Main components: Homemade mini lampshade, flashlight bulb, thick solid core wire, small pvc pipe, short-wide metal cylinder, altoids tin, switch, basic wire
Simple instructions : Just look at the diagram.