There's a little button on the bottom of the home screen that looks like 4 squares. Touch that, and it will take you to the screen where all your apps live.
I use two home screens, one has all my useful, every day apps like the market and Out of Milk, the other has all my games. The ones I don't use often stay on the main app screen.
I don't know about themes, but I have a cool aquarium live wallpaper. I love to feed the fish!
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