Costumes For Guys Diy . Head to a thrift store or h&m to find a white top and white jeans and then use black fabric paint to create different sized spots all over the piece. These creative diy costumes will up your halloween game and leave you feeling super creative. Pin on Halloweem from www.pinterest.com All you need a cardboard box, xacto knife and paint! Here are 15 fast and easy diy halloween costumes that borders on genius! Check out the best 2021 ideas now.