You need a home replacement app to run themes. Such as OpenHome, PandaHome, Fresh Face, or AHome.
Changes wallpaper, drawer background, icons, and clock widget. Check out my other themes and apps.
I'm currently playing: Words with Friends
Awesomeness of Angry Birds — Not only do you get Angry Birds. But now you get a round two with Angry Birds Seasons. You get the get you know, love and are addicted to but with a whole bunch of holiday themes.