diff --git a/core/util.inc.php b/core/util.inc.php
index fa2758d8..de63a676 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -197,6 +197,18 @@ function show_ip($ip, $ban_reason) {
 	return $ip;
 }
 
+/**
+ * Turn an IP address into a colour, for easily spotting samefags
+ *
+ * NOTE: this should only be shown to admins, as it can be reversed
+ * to get an original IP address
+ */
+function ip2color($ip) {
+	$b = explode(".", $ip);
+	#return sprintf("#%02x%02x%02x", $b[0]/2, $b[1]/2, $b[2]/2);
+	return sprintf("hsl(%d, %d%%, %d%%)", $b[3]*360/256, $b[2]*100/256, $b[1]*100/256/2);
+}
+
 
 /**
  * Different databases have different ways to represent booleans; this
diff --git a/ext/comment/theme.php b/ext/comment/theme.php
index 4dd60657..a764c9fb 100644
--- a/ext/comment/theme.php
+++ b/ext/comment/theme.php
@@ -153,7 +153,11 @@ class CommentListTheme extends Themelet {
 				$anoncode = '<sup>'.$this->anon_id.'</sup>';
 				$this->anon_id++;
 			}
-			$h_userlink = "<span class='username'>" . $h_name . $anoncode . "</span>";
+			$style = "";
+			#if($user->can("view_ip")) {
+			#	$style = " style='color: ".ip2color($comment->poster_ip).";'";
+			#}
+			$h_userlink = "<span class='username'$style>" . $h_name . $anoncode . "</span>";
 		}
 		else {
 			$h_userlink = '<a class="username" href="'.make_link('user/'.$h_name).'">'.$h_name.'</a>';