3D Printed Bow Tie
If you have access to a 3D printer and some scrap wire, you can be the hit of any geek party. In order to get the exposed infill, change your slicing software settings to print without a solid top and bottom layer. This creates holes to pass wire (or string) through to tie around your neck.
.stl file:
http://www.thingiverse.com/thing:32355
.stl file:
http://www.thingiverse.com/thing:32355