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I was hoping to get information on how to create my own theme
My advice is to first download one of the themes available on this site. This will allow you to see how all of the different pieces of artwork need to be named and how all the art/audio files should be organised. It's then a case of creating the art/audio/video, naming it correctly and pointing the theme creator to where the media you've created is located on your device.
Hey Charltron, I am currently making an xbox 360 nxe theme.
Good luck. I actually started a theme based on the original X360 blades UI but i couldn't get it to work quite how I wanted so I abandoned it.