cooky, one possibility would be to do a screen capture at at corvette site and use an image editor such as photoshop, etc. to enlarge it and thensave as wallpaper.

the National Corvette Museum web site has a nice selection of wallpaper and screensavers for free. I browsed a handful and the quality looks great, but I only saw cars, not the emblem you're looking for. There's an interesting anniversary screensaver with all of the logos/emblems http://www.corvettemuseum.com/pictures/screensaver/index.shtml