With my Philips DVP5900 there were user created hacks that allowed for different wallpapers and additional codec support. Does the Hub Media Player have user created hacks too?
You don’t need hacks to change wallpaper and the Hub support so many codes, that you likely won’t run into problems there - But the short answer is:
No there aren’t any user hacks available to the Hub!
Instead of having to create hacks to do things, Western Digital pretty much allows full user customization through theming, therefor diminishing the need to hack anything