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Currenty the Google+ badges are available with the following style-related advanced options:
- width - valid range is between 100 and 1024 pixels
- color theme - valid options are "light" and "dark"
To implement this, data-width and data-theme parameters should be passed.
I think this is a quite important feature to have, since for most of themes I work with (usually I do custom theming) the default width is too large.