The costume that won the wallpaper war is the Ninja. And the subtitle for this piece is: "Ninja Quinn! Attack of the Pumpkin Men."
Full view is 1600x1200 and it should scale down easily to the common resolutions.
The color thumbs that were considered for this piece are here:
Batch 1: [link]
Batch 2: [link]
Here be this year halloween costume finalists:
Special kudos to Zorla who threw ideas at me for this and last years halloween wallpapers.