I found this site through an ad on I-Mockery for a guy who makes cuff links and tie tacks mainly out of LEGO pieces that would be so awesome if only I ever needed cuff links, check it out;
http://www.etsy.com/shop.php?user_id=5518165
Some of those Clone Pilot ones or the Indiana Jones/ Henry Jones set would be so nerdishly awesome. I suppose they wouldn't be hard to make yourself, just need some pins, parts and super glue, but still a cool idea.