To the mods; I know it doesn't look very lego-related whilst in edit mode, but the final thing is definitely a lego lightsaber. You can check on the final part of this tutorial, pic 5: It shows the final result when your render it. It's definitely a lego lightsaber. I don't know of any other looking like that. Please let it through!
(Long title :P) Well, as promised, I've made a tutorial for making a lego lightsaber in Blender. I'm not going to do a whole minifig tutorial: It would take aaages, and I've got an MMORPG to build :P. Anyway, here we go;
Download Blender and open the application up. It will show the startup file (a simple box with a light and a camera.)First of all we want to get things easy to manoeuvre around, so click the bar that says View (the one next to Select, not next to Marker.), and then click View Persp/Ortho from the drop-down list (or you can click 5 if you have a number pad). We don't want a cube, so click x on the keypad and confirm the delete of the object. Then click shift-a/mesh/cylinder to add a cylinder to the scene. Click tab (left of the q) to go out of object mode and into edit mode. Click a to deselect all, then z to make the object transparent. Click the view that you clicked earlier, and choose Front. (Or 1 if you have a numberpad). You should have something like pic 1.
Click b, and position the cursor like in pic 2. Click-drag, selecting the lower dots (called vertices) of the object like in pic 3. Click e (for extrude), and position the extruded vertices like in pic 4, clicking to confirm the position. Click s (for scale), and scale the vertices outwards a little bit, like in the final pic. Look at the next part for the rest of the tutorial! ;)