Wear a pair of 3.5'' floppy disks (shrunk down to about 1/2'') and show off 2.8 megabytes worth of bling. 1.6 megs or 800k, if you're old school like that.
Fully detailed front and back, anyone old enough to have used a computer more than ten years ago will recognize the little floppy disk. Younger people may recognize them as the "save" icon.
Available in brass (pictured) or a variety of precious metals. They come with matching gold or sterling loops.