Besides holding loose ammo rounds?
How about a makeshift stove:
Related to that... use one fo grillin' and chillin'...
Saddle bags for your bike:
Other ideas:
Throw a bunch of medical items in them and use one as a first aid kit
Put a handgun and ammo in some foam padding, then you...
Im looking for ammo cans locally so I don't have to pay shipping.
Where is a good place to find them or PM me what you have and the price you'd like to get for them.
--Christian