I spotted this idea in one of my magazines (think it was Country Living - I subscribe by 4x my Tesco clubcard vouchers!) and I knew instantly that I would try it out. I'd been meaning to try it out over Christmas but just didn't get round to it and so last night when I was making bolognaise and had two empty tin cans (from the chopped tomatoes since you asked!) I decided to try it out.
Fill up your clean tin cans with water and pop them in the freezer. Leave overnight. The water acts as a buffer so you don't distort the shape of the can as you punch.
Roll up a teatowel and position your can onto it (it stops it rolling around while you punch)
Then basically use a hammer and nail to punch holes in any pattern you see fit!
The first few holes :) When you have finished your design leave your cans in a bowl so that the ice can melt. Put them in a bowl rather than just the sink so you collect the water to use on your plants.
Don't they look pretty? I had to sneak down into the freezing cold, dark cellar to get these photographs :)