Whether you need a dice costume for a Halloween party, theme-night, or other event, this instructional shouldn't take long to complete and utilizes things you could easily have around your home.
Box cutters and scissors are potentially dangerous. Adult supervision and/or assistance should accompany any younger person who attempts to utilize these tools on their own.
This would be easiest if you have a person assisting you.
Choose a cardboard box that fits over your body. Once you have a box that's big enough, assemble it leaving one side open. Using the box cutters or scissors, cut off the flaps so you have five solid sides and one open side. The open side will be the bottom (where your legs will stick out).
Have your partner measure the circumference of your head at it's largest point and maintain the size. Placing the open side of the box down, place the tape measure circle on the top of the box and trace it. Cut the circle out about two inches wider than your trace; this will be your head hole. You will need to easily slide in and out of it.
If you want mobility of your arms, then slip the box on and have your partner estimate where your arm holes need to be; mark the center of this spot. Again, using the tape measure, get the circumference of your arms, trace the holes on the box (centering it around the mark that was made), and cut out about 2 inches wider than the trace.
Using what you have on hand (for spray paint use acrylic glossy, for liquid paint use acrylic or latex; see this article on how to paint cardboard) paint the entire box white. Apply as many coats as you want to achieve desired shade.
With the poster board, make a circle right in the center (size of your choice), cut it out, and you've created a stencil. This will help create the dots or pips on the dice.
When the white paint is dried, place the stencil against the box and paint/spray the pips onto the sides. Your head hole can serve as the one-dot side; you will not need to paint this as it is a hole. Note that since you only have five sides, you won't be painting a six-dot side (six-dot side is the opposite side of the one-dot side). If you wish to maintain the pattern of a real die, your front would be two-dot, your back would be five-dot, your left would be four-dot and your right would be three-dot.
Allow the box to dry completely before wearing to prevent smudging of paint and from getting it on yourself or your clothing. Adorn yourself in clothing underneath the box/die; all black or white is suggested.