$addr=substr(preg_replace('/[^a-zA-Z0-9]/','',$_GET['addr']),0,34);

$colors=str_split('00'.addressToHash160($addr),2);

//html version:
//for ($i=0; $i<7; $i++) echo '<div style="float:left; width:50px; height:50px; background-color:#'.$colors[$i*3+0].$colors[$i*3+1].$colors[$i*3+2].'"></div>';

//png version:
$img = imagecreatetruecolor(350,50);

for ($i=0; $i<7; $i++) {	
	$color = imagecolorallocate($img,hexdec($colors[$i*3+0]),hexdec($colors[$i*3+1]),hexdec($colors[$i*3+2]));
	imagefilledrectangle ($img,$i*50,0,$i*50+49,49,$color);
}

header('Content-Type: image/png');
header('Content-Disposition: inline; filename='.$addr.'.png');
header('Content-Transfer-Encoding: binary');
header('Pragma: public');
header("Cache-Control: private",false); // required for certain browsers    
ob_clean();
flush();
imagepng($img);
imagedestroy($img);