Plaster shell motif

While searching for ideas on how to make my shells I came across http://www.ehow.com/how_4464284_make-plaster-molds.html, which gave me an idea on how to make the shells and other motifs to decorate the office.  I'm certain if you're creative you'll find it interesting also. I liked the idea about the Vaseline, I've used cooking oil before as a release, but  the Vaseline is a thicker viscosity and it should release the details even better. I'll let you know, Freezing today and so slippery be safe.
Bonnie