User blog comment:Rupert Giles/Introducing Updated Global Navigation/@comment-5645428-20141023130257/@comment-89.240.245.99-20141024132056

The colour won't be able to changed without additional CSS.

"Such an experience effectively necessitates a couple things - that search should be in the global nav and that the nav should have a visually consistent Wikia theme. Were the nav to be styled to match the local community’s theme, that wouldn’t give any indication to the user that you can search for other content."