These are probably meant for six-year olds, but they still provide me with gobs of joy. All you need is a black olive (for the penguin head), a bigger one (for the bulbous bod), a little carrot medallion (with a triangle sliced out for the beak), and a mozzarella ball (or cream cheese works). Extra credit if you can make them an edible igloo. It's pretty self-explanatory but check out mathea.tanner's adorable Flickr photos or if you really need step-by-step instructions, here you go.
Related: Photo of the Day: Penguin Tteok