Print, cut, fold and glue or tape and you have a 12-sided die (or make several and have dice).
You can play any number of games with these. You could use two and have the game be to add the two values that come up.
Also, use this as a template to make any number of your own 12-sided creations, either by hand or on your computer. I have used it to make some arithmetic dice cutouts that you can purchase here.