The National Hockey League (which is made up of Canadian and American teams... just go with it) starts up again this week, so I did my nails to celebrate the return of my NHL team, the Pittsburgh Penguins. I painted my nails white and then applied some nail decals which I made myself by printing onto special water decal paper. I bought the paper off eBay but you may be able to find some in craft or hobby shops.
Even being careful with the application of my topcoat, they still smeared a little. Still, they're a great way of doing small intricate designs, like sports team logos, that you don't have a stamp for and can't freehand that detailed.