At the beginning of every session, the GM makes 20 "extra" dice available and places them in a cup: 12 white dice, 6 red dice, and 2 blue dice.

White dice are normal dice, red are Expert/Hard dice, and blue are Trump/Wiggle dice.

Each time someone does some great roleplaying, any OTHER player (i.e. no nominating himself), including the GM, can nominate the player for a draw from the dice cup. If the GM agrees, the player gets a die at random.

If a player with one or more reward dice really likes whatever another player is trying to do, he can also give one or more reward dice to the other player as bonus 'gift dice' just before the roll is made. Whatever 'gift' die is picked needs to be spent on that roll.

At the end of the night, the players turn in any unused dice (so, they have to keep them seperate from their normal dice).
 
This is a good way to encourage some drama or other coolness. The GM can be pretty liberal awarding dice at first, then tighten up and start being a little more demanding.

The group can also use different colored poker chips instead of dice.