(Update): Ok, this is part of Google's new "+1" feature. It was added automatically because it is now part of the "share" widget". We are looking into whether we can change the colors or remove just that without taking away all the rest of the "shares"... Alternatively, maybe I should get counseling about my color OCD... :)
(Update 2) How to remove google plus one (+1) button
Note, I accept no responsibility if you try this and somehow manage to boggle up your template!
I haven't had luck changing or masking the color scheme, but if you're looking to send it to the curb, here's a few options:
click "expand widgets" and look for:
<div class='goog-inline-block dummy-container'><data:post.
and delete that, it seems to go away.
You can also add a class in the tag like "sb-plusone" as follows:
<div class='goog-inline-block dummy-container sb-plusone'>
and then put
in the CSS section of your template (between the "style" and "/style" tags), the plus-one button will also be hidden. This later method is probably the better one, as you can easily add the button back if you want to. The down side is it may get undone if google updates the widget, but not sure about that.
Unless a crazy idea strikes me on how to display a different image, we will leave them hidden for now.