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.