Why don't you use the .png variants I posted. You can always go into the style css and add replacement variables so the existing star icons pull the .png which will result in the icons looking seamless against all your backgrounds on all your styles.
At the very bottom of your "all style options" page for each style (where you input the css values, etc) you'll see a box titled "Replacements Variables". Click "Add new replacement variable", select the style you want different images to show in. In the Search for Text box type in the original url, eg /images/icons and in the Replace with Text box type in the new url to the images, for example /newstyle/images/icons
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