There are blogs, books and endless YouTube videos dedicated to re-purposing office supplies into everything but productivity tools. But with this 3D-printed plastic tube you can easily turn a thumbtack, a few sticky notes and your office's cork board into a game of darts.
You can order designer Elvin Chu's Prisma Dart through Shapeways for just $14 each, which is a little on the pricey side for a hollow plastic tube. But thankfully you can scavenge everything else you need to turn it into a usable dart from your office's supply closet.
And if people wonder why you're throwing office supplies at your bulletin board, you can just add little productivity notes to your Prisma darts and claim you're using them as reminders, and not a way to recreate pub night in your cubicle.