I've patch class org.apache.maven.plugins.surefire.report.SurefireReportGenerator so the total- and the package-summary will be decorated. Used css classifiers in span html elements are:
You're now able to define these css classifiers in your css file, i.e site.css (no must). For an example see the appended screenshot.
The appended patch contains the patch parts of MSUREFIREREP-30 and MSUREFIREREP-31 too.