$7.00 DIY Lego Costume. This was great inspiration. I am a "mom on the go" though, so I didn't have time or patience for the perfection this how to called for. Mon's Tip: Paper mache' a small propane tank. (Cover it in Saran wrap first though) Sand Paper Mache' as needed, cut out holes and paint. Used Black Panty hose for the eye and mouth holes. Only cost is for paint, and newspaper.