Here's an awesomely creative example of being resourceful: a Star Wars fan built a Stormtrooper helmet out of two milk jugs. Yes, that helmet in the picture was made with those plastic milk gallons in your fridge right now.
The full instructions are available over on his site but the gist of it was rather simple. He used an exacto knife to cut out specific pieces of the milk jug and a hot glue gun to put it all together. Some spray paint and a sharpie finished up the project, leaving him with the best bang for your buck Star Wars helmet available. I wonder how he would make Darth Vader. [Filth Wizardry]