skins/sam/test-skin.css

.yui3-skin-sam .yui3-console-entry-pass .yui3-console-entry-cat {
    background-color: green;
    color: #fff;
}

.yui3-skin-sam .yui3-console-entry-fail .yui3-console-entry-cat {
    background-color: red;
    color: #fff;
}

.yui3-skin-sam .yui3-console-entry-ignore .yui3-console-entry-cat {
    background-color: #666;
}