So I started making a theme based on the XMB, it's always been my favorite interface. I don't know if I'll continue it because of some problems and general lack of time so here's everything for you guys if you want to take a shot at it.
Originally I wanted the platforms to slide horizontally where the XMB is (currently non-functional, just there for looks) using left/right arrow keys and up/down arrows when you're on a platform to look through all the games.
Some pretty cool things, the waves and background are separate so if you change the background.jpg file out for your favorite image, the waves will still show over it. You can remove them completely in xaml or you can add a blank png for waves.png.
This "theme" is only for the Platform Wheel with Image Details and Thumbs view, I'm sure you could easily replicate across the other views.
Anyway, expand on, improve on, put a trollface on it, add a sad face to it if you don't like it. Basically, enjoy! UPDATE
Still working on this thing. Now includes:
Game View
Platform View
Sounds
Animated Wave
Glitches/Bugs:
Sometimes there's a little lag in loading another view.
Sometimes the video will stop completely if you leave unattended for a long time, alt-tab in and out of BigBox.
Put BigBoXMB in your Themes folder and your settings are like mine:
If you want the PS3 sounds, just overwrite the sounds I provided with those in your Launchbox. Make a backup of the originals if you want to revert.
Here's a video and the updated files are included.
BigBoXMB.zip