an xbox theme is a background to your dashboard, like i downloaded a left 4 dead theme and when i turn on my xbox it is the background.
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You actually can. go to my xbox click on your gametrag and click change theme,should come with a few free themes.
You are not able too.
you go in to the store and search it and its free !!!
Points vary on what theme you are wanting. Maybe 80-300 points.
Reverting back to the original "Theme" as Microsoft calls it is simple. You simply need to open your profile and go to the theme's page. In this section should be the original theme or others if you downloaded any extra content.