I'm all for fun and experimentation, but it's adult's jobs to keep kids from making life threatening mistakes.
Plus material like this: http://www.cooks.com/recipe/p149f8qz/salt-clay-dough.html
Which is harmless and if varnished can last years (a lot of people make Christmas decorations out of it).
//Edit: OK, people, the comment about weeping for the future of children was meant in jest! Nearly killing ourselves as kids wasn't helpful. The notion that we did all right is survivors bias.
reminded that nothing makes you run faster than an "enemy" with an air rifle with crafts-clay "bullet". Leaves nice haematoma even through wool pants :)
I'm all for the progress, yet i think abolishing BB guns/air-rifle battles isn't the one. Making sure that everybody wears safety glasses would be the one (we didn't have the ones, and that i think was unnecessary risk) Lead of course has to go.
Another - i see in the park children playing battles with "swords" which can't deliver any pain - foam wrapped by duct tape. We had "swords" we carved out of wood. They could deliver some pain, and that made the fight more lively i'd say :)
Yeah, it's a shame we don't kill or permanently injure our children for the sake of our own nostalgia. Because the experiences I had as a kid are the only kind of experiences worth having.
There is a balance to be met, sure. But in choosing safetely measures we are taking out insurance. We prevent the worst, at the cost of preventing the best.