This sheet of nail stickers is from LadyQueen. There are four different designs and you get six of each design. Three are penguins, and I think the other two are seals.
They are stickers so all you need to do is peel them off the backing and stick them to your nails. I like to use a top coat to seal them in so they don't get caught in my hair.
I know it is still August so summer here in the northern hemisphere but I had to add some snowflakes to these penguin nail art!
I also used the seal stickers for a French manicure twist;
Penguin Stickers - $1.76