Dude, dripping paint and dripping water are essentially the same, they're both fluids and behave exactly same. Hell, you can even use some rust texture, like this one http://cgtextures.com/login.php?&texid=11406&destination=texview.php?id=11406&PHPSESSID=0db57dddf08bd378285b7e446f156b6f Just desaturate, up the contrast,…