I found this on reddit, and it is a great theme. I wanted to keep the [url=http://4.bp.blogspot.com/-GV32_6UwAFY/T3y20ZvmrAI/AAAAAAAAGRw/YjpMNiIIAe8/s1600/bungie-goodbye-wallpaper.jpg]Bungie Goodbye Wallpaper[/url] for my wallpaper, so I only used the sounds. The things I know the sounds change for sure is device inserted is the DMR scope in sound (I think), device removed is the DMR scope out sound (again, I think), Low battery is a low/no shield sound from one of the games, as is system alerts, and logging on plays part of one of the themes. It's all very cool, and definitely worth the download.
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I downloaded the Reach one (which is like the same thing for sounds).