Here's the colors which match the ones used in VBStats and also the other colored CURRENT online users hack.
Code:
if ($todayuser['invisible'] == 1) { // Invisible User but show to Admin
$invisibleuser = '*';
}
if ($todayuser['usergroupid'] == 6 and $highlightadmin) {
$username = "<FONT COLOR=red>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 5) and $highlightadmin) {
$username = "<FONT COLOR=darkred>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 7) and $highlightadmin) {
$username = "<FONT COLOR=green>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 4)) {
$username = "<FONT COLOR=black>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 8)) {
$username = "<FONT COLOR=orange>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 3)) {
$username = "<FONT COLOR=black>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 1)) {
$username = "<FONT COLOR=black>$todayuser[username]</FONT>";
} else if (($todayuser['usergroupid'] == 2)) {
$username = "<FONT COLOR=blue>$todayuser[username]</FONT>";
} else {
$username = $todayuser['username'];
}