User blog comment:Rupert Giles/Global Navigation January Update/@comment-131168-20150211140816

As users scroll down the page the white Wikia theme will turn transparent thus “inheriting” most of the look and feel of the local community 

I've just started seeing this change, but I don't think it really makes things blend. For one it's not very transparent, so it's still a big strip that doesn't really the look and feel of the local community. But more problematic is that when this happens its color scheme fades from dark-blue-on-white to white-on-transparent-black, so instead of having the effect of blending in it draws attention to itself every time you scroll from or to the top of the page. Sticking with either of the two color schemes would be better, I think.