Super-low priority thing, but http://gradle.org/common/img/favicon.ico has the same color pattern used for gradleware.com not the inverted one used throughout the rest of gradle.org.
Since it’s being pulled from an absolute /common/img/favicon.ico location, I suspect it’s actually serving up the exact same file, unlike the logo, which is served up via a logo.a stylesheet class pointing to a relative …/img/logo.png reference.