John Chen (Madox on Shapeways) has just added some great products to his line up. His propeller hat cufflinks are now available in gold. He also has a great pair of locomotive train cufflinks. My favorites through are the Lego compatible cufflinks. You can add your Lego bricks to these cufflinks to customize them. I would not recommend adding the Lego Millennium Falcon to your cufflinks however. Wearing one's heart on one's sleeve is never a good idea. Also, it would not be practical.