Meeting Richard Horvitz dressed as Zim was one of the best days of my life. Meeting Jhonen was pretty exciting too. My friends and I recently did a group.
The Membranes: http://th09.deviantart.net/fs70/PRE/...is-d4htzby.jpg
Me as "disguised "Zim: http://fc04.deviantart.net/fs70/f/20...is-d4jjkxk.jpg
I had a second outfit that day that had the full red contacts and no hair.
We went for the realistic look, it was received well. This was one of the most uncomfortable cosplays I've ever done - full contact lenses that made me cry (literally), dental veneers, bald cap covering my ears, chest binder. It's not one I plan on doing again too soon unfortunately.