What about only putting in dice that have failed you? A d20 that rolled a natural 1 at a critical juncture, a handful of d6s that rolled several standard deviations below average, that kind of thing?
This could go with the broken dice suggestion above. Though I have the same visceral reaction against the notion.
On the other hand, you'd need to store this Skull of Horrible Dice far, far from any other dice, to keep your others from getting corrupted.
...
Otherwise, I'd personally fill it with sharp-edged (Gamescience-style) transparent/translucent dice, a grab bag of colors and traditional types.
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This could go with the broken dice suggestion above. Though I have the same visceral reaction against the notion.
On the other hand, you'd need to store this Skull of Horrible Dice far, far from any other dice, to keep your others from getting corrupted.
...
Otherwise, I'd personally fill it with sharp-edged (Gamescience-style) transparent/translucent dice, a grab bag of colors and traditional types.