Easy Fast Diy Halloween Costumes . Follow shrimp salad circus’s quick tutorial to create this simple cactus look. You’ll gain huge points for creativity and hilarity with this costume! 65 LastMinute Halloween Costume Ideas You Can Quickly DIY Quick from www.pinterest.com One of my friends from college, shelli was unrecognizable by many of her friends when she showed up in this costume! Fast(ish), easy diy halloween costumes. Great for groups or for two teenage girls.