If you want more tins then the coffee shop "insomnia" sell them
Marks & Spencers in England do a very similar mint in a very similar tin. Try one of the branches in Ireland. (When I asked an assistant where they kept the mints in my local shop, she very kindly led me to the 'tinned meats' section [mints . . . mince] ;¬)
Once you've got a load of tins, (and I've read the question properly) you can make any of THESE.
If you only have one, make something that does not damage the tin itself, such as the rubber-band boat, emergency candle, survival kit, or bread bake.
if you really wanted to, you can buy some empty tins on ebay
depending on the stuff you like and the money you have to spend on it, i would make an altoids tazer... shock your fiends and enemies, i think i just struck gold.