Shoutbox

More of an annoyance than anything, but I remember changing a color choice to purple at some point (don't ask why).  I remember thinking at the time I was changing the text color, but it ended up changing the color of the contact pop-up window as well as the background (skin color) on the main messenger window and the background of the main plus window.  (the chat windows are fine)

I have a feeling I did this before plus was upgraded the last time & it kept it as my color preference, but now I cannot find any way to change it back.  Is this something that the new version of plus won't let you change anymore?  Maybe just something simple I'm overlooking?

Any ideas?

(screenshot attached)