Paint blocks of wood with glow in the dark paint, then have some fun with black paint for their faces. OR Paint the wood black and the faces with glow in the dark paint so the eyes and mouth "float in air".
***Awesome for front window! I love this Halloween window decor idea, with orange lights and black silhouettes -- it's classy and simple. (She used a chandelier decal from Target and a black cat silhouette from Martha Stewart.