Here's how I modify PerlMonks style to make it look clean and fresh:

body {
    font-family: arial, sans-serif;
    font-size:85%; /* YUI CSS */
}
tr.post_head { background-color: #ccccff; }


tr.section_title {
  background-color: #ffaa66;
  border:1px solid #ff6644;
}

.superdoc {
    /*background-color:#006699;*/
    color:#006699;
    padding:7px;
}


h3.other {
    background-color:#006699;
    color:white;
    padding:3px;
}


.code {
    background-color:#eeeeee;
    color:navy;
}

.topnavmenu {
    background-color: #ccccff;
}



.topnavmenu a:visited {
    color:#001188;
}

.chat {
    font-size:77%;
}

.nodehead {
    background-color:#ddcc00;
}

.nodebody {
    font-size:77%;
    background-color:#ffffee;/*#ffffdd;*/
}

tr.titlebar {
    background-color:#995500; /*#883300;#007766;*/
}

td.titlebar {
    padding-top:5px;
    padding-bottom:5px;
}

.titlebar a {
    color:white;
    font-weight:bold
}

#replies_table th {
    background-color:#005544;
    font-size:92%;
}
[download]

(You probably need to save this somewhere on the web and the point to it from your stylesheet user settings.)