I think it's fine, personally, however obviously I can't speak for everyone. Could Bara add to his already long 'To Do' list the ability for a user to set a preferred background and text colour in their Account settings? Obviously this will create clashes with the overall design of the site(s) - however it should be up to a user to determine what is or is not best for them.
On a side note: does Elemental's site's colour scheme changes reflect the in-game UI changes/over-haul that we are yet to see?
I've wanted to implement the ability to change what forum style you wish to use across all Stardock sites (eg: Use ImpulseDriven theme for all forums), but unfortunately have not had the time.
And I'm not sure what the Elemental UI looks like right now, so I can't answer that. However, from what I've heard, this design was primarily created to have a "wow" effect, and is not necessarily representative of the game.