There are many ways to make a lightsaber. You can turn a flashlight into a steampunk lightsaber, you can make a lightsaber from junk, and you can make one that looks totally real (if you've got the money and time). Heck, you can even make one in Photoshop. And now you can make one using an infographic! Who doesn't like infographics?
This infographic by Herbert Pocket, which may or may not have been inspired by this lightsaber infographic, will show you the quick route to making a Star Wars worthy lightsaber from PVC, LEDs, bicycle tire inner tubes, a small motor, and a few other odds and ends. You can also check out this Instructable project by Nagle, for even more inspiration.