You could go with a traditional DIY lightbulb vape, you can find a tutorial at All Original Drunk Videos, Shamings, Funny Videos, Weed Videos, and Funny Pics and Forums!

As for the doob tube, you can always just blow it into a towel, just make sure you store it somewhere or rinse it out afterward because the towel will probably smell pretty bad (I've never done it, but at my school people use it in the dorms all the time).