Lego Halloween Costume Diy . Once the paint is dry, use your super glue again and glue the knobs on to the box. And boy, do they keep us busy! DIY Lego Costumes Sew Woodsy from sewwoodsy.com In addition, cut two pieces for the arms:. The lego head or mask for a lego costume does not seem to be readily available from retailers, so you are in for a few hours of diy if you want a lego costume. Epic blue lego ninjago diy kids costume.