Colorful rainbow-inspired eyes instantly rule Halloween. To get the look, use the e.l.f. makeup collection palette. First, pat a yellow eye shadow all over the lids, concentrating the color in the middle of each eye. Next, apply a blue shadow to the inner creases and outer corners, and line your eye with a liner brush and pink shadow. Blend the colors together with a small shadow brush. E.l.f. faux lashes and a baby pink lip, like e.l.f. Matte Lip Color in Natural, complete the costume.