If you want to try this intro and menu, the files are located here.
Essentially all I did was replace the Bink video files with different ones. This isn't too difficult and you can convert your own videos using the RAD Video Tools available here.
The hardest part is getting the video in a format it can accept (AVI or MOV)(Or in the case of the menu an image works)
The menu is also able to be a video file, but I just replaced it with an image.
You can literally make them whatever you want.
Pretty darn sweet! Only note from me would be to use the correct 343 logo :D
You can find some of our logos on the Xbox Wire Media Library here: https://news.xbox.com/en-us/media/?sm=halo