I think it's fair to say that the background images are pretty average looking at best especially when it's a modern player supporting modern video technologies.
I think it is time the built in logos got updated with nicer, more modern ones.
Here's one that I put together and am currently using:
I know the background logo is seldom seen by most but it's something that improves the visual appeal of MPC nonetheless.
Perhaps a community effort to create a few new logos that could be patched into the ongoing dev builds?