New handmade skull rings recently introduced by Solid Alliance actually do double duty as USB memory sticks. Simply pull the lower jaw off to reveal the USB plug. The rings have a storage capacity of 2 GB and take about two to three weeks to make.
Akihabara News describes them as being "gothic," but I think they are perfect for Halloween. At $145 they are way too pricey to be passing them out to trick-or-treaters, but they would be a cool way to take some of your favorite holiday appropriate music to a Halloween party.