My slogan is "Tech Writer, HTML5 WG irritant".
Based on this slogan, I copied the new HTML5 shield logo and then added my own alterations: a black cat's paw print that has gouged deep scratches into the HTML5 shield.
The HTML5 logo is shaped like a mythical knight's shield, or something you might see across Superman's chest. It's like a really fat downward pointing arrow, a little wider at the top than the bottom.
The shield is in shades of orange, with the number 5 in white, block letters.
How you interpret both the cat's paw, and the scratches is entirely up to you.