I was experimenting the other day with ice but I realised that whenever you tried to use it as a projectile it would shatter. So I thought that it would be good if i could somehow reinforce it like reinforcing concrete with steel. Anyway I came up with the idea of wetting paper towel and then freezing it (it doesn't take long to freeze), and it worked really well! I tried all sorts of things with it, I wrapped in into little balls and they turned as hard as stone. But the great thing is that you can mould it any shape and when it starts to melt or get broken you just put in the freezer and it heals back up. I think paper towel has potential. try it out yourself.