To be entered in a random drawing for a pair of cufflinks, just leave a comment below saying what you would get a skull for its birthday. [If you're reading this on FACEBOOK, be sure to leave your comment on the actual Skull-A-Day blog post if you want to be entered in the drawing.]
IMPORTANT: Don't forget to include a way to contact you (either an e-mail in the post OR make sure your Blogger profile has an e-mail link for you on it).
And of course you don't have to wait til the end of the contest to get your own cufflinks from Linkyourshirt.com. You can even be their fan on Facebook!