I've been having a lot of fun with the glow effects in Photoshop! Here's some examples of what I've done. I'm not mad on some of the patterns and shapes I've given this little fella, but I like the way it makes certain areas of his body stand out more.
I also tried outlining his body with a black glowing line, which made this:
I kinda like it, though I think it would need to be toned down a bit, so that it doesn't hurt people's eyes!