The smaller ones can be used as caltrops. D4’s work better but the D6 can be used in a pinch.
Plugging that hole in the wall. You know the one. The one your “friend” made with their heavy metal dice and that crazy initiative roll so they could go first against that sickly one-legged orc with no weapons. Ya, that one.
Stacks! Lots and lots of stacks. Stacks are fun! It's like building a skyscraper, but with dice.