I have the multimedia charging dock for my DX. I recently got the some aquarium live wallpaper with the fish swimming around as my background (pretty cool actually). The wallpaper is awesome, however it kinda makes my phone lag when scrolling between screens (none the less, its still a really cool app).
What I like mainly about it is that when I put my phone into the multimedia station, the background still looks like an aquarium with the fish floating around.
Im thinking there should be (or already is??) an app where you can select different wallpapers for when the phone is in the multimedia station and when it is not.