My "go-to" post workout snack is a protein shake. I typically mix 2 scoops of vanilla whey protein with 16oz of orange or grapefruit juice. This is a very convenient snack for me, and contains a good amount of protein to help repair muscles and carbohydrates to replenish glycogen. Many times I don't feel like eating all that much immediately after a workout, but I'm always able to drink a shake.
After a workout I love snacking on plain yogurt with fresh berries. Protein and carbohydrates together have a better response to post-work out recovery than either alone. The protein in the yogurt helps repair and build muscle while the fruit adds some carbohydrates and natural sweetness!
My go to post-workout snack is a strange but rather delicious meal. I mix together half a cup of oatmeal with a tablespoon of peanut butter, one scoop of chocolate caramel whey protein and a quarter cup of maple syrup. It's loaded with protein and simple and complex sugars that aid to initiate protein synthesis and replenish lost muscle glycogen. A glass of skim milk always helps wash it down too.