Initialize

.htaccess

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+RewriteEngine On
+RewriteBase /color-icon/
+
+RewriteRule ^hex/(.+)$ index.php?hexcol=$1 [NC,L]

index.php

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+<?php
+$my_img = imagecreate(15, 15);
+$hexcol = htmlspecialchars($_GET['hexcol']);
+$r = hexdec(substr($hexcol, 0, 2));
+$g = hexdec(substr($hexcol, 2, 2));
+$b = hexdec(substr($hexcol, 4, 2));
+$background = imagecolorallocate($my_img, $r, $g, $b);
+header("Content-type: image/png");
+imagepng($my_img);
+imagecolordeallocate($my_img, $background);
+imagedestroy($my_img);
+die();