Action Decks and Prophecy Shards (bennies) before, but I've finally acquired some appropriate Wild Dice. Crystal Caste's translucent red crystal d6s are perfect; they look like they came right out of a geode of Eberron dragonshards.
At first some of my players were skeptical or seemingly disinterested when I emailed them the idea, but as soon as I dropped them on the table, they were all grabbing one and rolling them throughout the session.
They were actually a bit larger than I had anticipated. They measure approximately 1" in length, so they feel pretty substantial. I had also anticipated they'd roll for quite a long while given their shape, but they stop pretty quickly after rolling them.
Honestly, I think I might use these for just about any fantasy Savage Worlds game I play or run.
Now I just need an appropriate "benny box" to store it all.