First cut the top off the can
Cut off any access can that you see on top. You can should be near flat all the way around on top.
Then cut into strips
It should look like this when your done cutting.
Now flatten, like this, so it looks like a flower.
Now Ararat to fold, like this
Now you have a flower! You could make some more, and hang them up, or use them to hold stuff. Your choice!