Over the past six months, one simulation I've used is called Movements of a Hypnotic Nature (see slide 14 for more details). Good things were said about it, so I tried it. The simulation requires play-doh, golf balls, string, straws, etc: lots of interesting things used to build a simple product that moves and has an aesthetic quality.
There were two problems with this simulation. The first is that the connection between the simulation and Scrum can be a bit nebulous. It's not a bad simulation, but I've found better ones (e.g. some based on Legos). The second is traveling with all this stuff. It adds a lot of weight and recently when I was packing, I noticed that the pay-doh, timers (used for time-boxing the simulation) and wires for all the gadgets I carry happened to pile-up in a disturbing configuration:
Airline security is enough of a hassle right now without this being seen by a baggage inspector. Sorry future workshop attendees, but play-doh based Scrum simulations are now off the menu!