Gumball Machine Costume Diy . If you want to make your own, check out the super simple instructions below! Cut one of your dried balls in half and glue into the half circle, so it looks like a gumball is coming out of the machine. Gumball machine costume...adorable! Halloween costumes for girls from www.pinterest.ca Making the gumball machine costume. You can cover the entire shirt or just a portion, as desired. I paired the gumball machine.