Lamps are easy to come by, but if you want to make your own, Make shows off an incredibly simple build that stuffs a flippable light inside a small jar.
You'll only a few very cheap components, a jar, some soldering skills, and about 30 minutes of your time to build one of these. When you're done, you have a little light that you can simply flip over to turn on. If you're new to soldering or electronics in general, this is a great little entry-level project to get you started.
Solder a Mini Flip Light [Make]