Icons when created well can look absolutely spectacular. The little details and colours make you look really closely to see what makes it better than most other icons. Icons have also become fundamental parts of user interfaces and the face of an app or program. They can liven up any UI with colour and become an iconic face for an app or program. Any designer out there will love looking at some great icons, whether it be for inspiration or just checking out the awesomeness.
Make sure to check out the last one – App Icon Design | Part 2