On my Message Board at El Muerto.com, I usually try to change the icon in the header everytime a holiday comes up. We just posted the 4th of July icon, the Yankee Doodle Zombie, as I like to call it!
Here you can see the 6 different icons I've used since launching the Board last July. I've missed a couple of holidays, but they'll always come back the following year, so no big loss!
Unless I really screwed up, you should recognize the icons for the 4th of July, Cinco de Mayo, St. Patrick's Day, Valentine's Day and Christmas. The one on the bottom right is the standard image I use when there's no holiday around. This Muerto icon image was created in Adobe Illustrator. Basically I did a quick sketch of El Muerto in the style of the Aztec Codices. Then I recreated it using the pencil tool and dropped in a little color. I had wanted to capture the iconographic simplicity of the Codices, but also I was looking to create a design in the mold of PowerPuff Girls or Mucha Lucha.
It's easy to alter the base image, and I think they look pretty cool. The Valentine image proved so popular I slapped it on a button, and sell 'em for one $1...