Cool Costume Under $20: Aquarium

Your Halloween will go swimmingly in this costume.


  • Large cardboard box
  • Silver paint or construction paper
  • Blue cellophane
  • Duct tape
  • Craft foam
  • Fishing line
  • Seashells
  • Plastic greenery (available at craft stores)
  • Snorkel mask or goggles and flippers (optional)


Cut a hole for your head in the top of the box. Cut large squares out of all four sides. Paint the box or cover it with construction paper. Cover the back window with a large piece of cellophane and tape it to the inside of the box. Tape strips of cellophane inside both side windows. Cut sea animal shapes out of craft foam. To hang, thread fishing line through a small hole in each shape, then tape the fishing line to the top of the box. Tie or tape fishing line around the seashells to hang them. Tape greenery inside the front of the box. If you like, wear a snorkel mask, goggles, or flippers for photos. For safety, be sure to remove them before you go trick-or-treating.

Text by Julie Vosburgh Agnone
Photograph by Rebecca Hale/NGS Staff

Photo: a girl wearing an aquarium costume