Use Default Avatar in gravatar

Question

Is it possible to use a generic avatar if the user's email address is not in gravatar? I'd rather not use the colorful avatars, or the goofy ones that it auto generates.

Answer 1

Gravatar doc specify 'd' parameter for that:

Code exemple in PHP from Gravatar doc:

$grav_url = "http://www.gravatar.com/avatar/" . md5( strtolower( trim( $email ) ) ) . "?d=" . urlencode( $default ) . "&s=" . $size;