Yes. The more collectible ones of are Jackie Kennedy, Marilyn M. and yes, Lucille Ball!
The Encyclopedia of Head Vases by Kathleen Cole for Schiffer Publishing is a great resource if you want to start collecting them There is even a Head Hunters Newletter: Maddy Gordon's Head Hunters Newsletter at P.O. Box 83H, Scarsdale, NY 10583; annual fee of $24.