[Jtsummers]

Use physical objects like game tokens and a tray to represent blocks. Faster than handwriting or photocopying. Simple playing cards can also work (this "block" has 4 transactions, the AH, 2S, 3C, 10H).

Someone shuffles a handful of decks together, this creates the feed of transactions going into the network. "Blocks" are created by grabbing a random set of recent open transactions and rolling dice, like you suggest. Pair of ones and that "block" can be passed on to all the other nodes. Others can continue "mining" if they want and try to create a fork, other miners may choose to base their work on the newest block.

Have some sorted stacks of cards or tokens available to quickly assemble copies of the blocks and transactions.