Dice can be moderately successful projectiles. Their ballistics are a bit on the less than reliable side, but for short range, low velocity use, they work well enough.
Disclaimer: We at Tish Tosh Tesh and Project Khopesh do not endorse projectile use, especially not during heated RPG sessions, family gatherings, or games of Monopoly gone terribly, horribly wrong.
Reminder: If you write about the Tinker Dice Kickstarter project on your blog and link back to the announcement post, we’ll send you an extra pair of the plastic dice, if we get the project funded. Thanks!