heres some ideas
http://www.elegantconnection.com/keepsakes.html
http://sheashells.com/ http://www.weddingflowersandmore.com/centerpiece-vase-flowers.html
http://cgi.ebay.com/Gorgeous-Seashell-Flower-Arrangement-in-a-Welk-Shell_W0QQitemZ370055073886QQcmdZViewItem?IMSfp=TL0805261126a28799
Scroll down on this page and there some instructions for designs using a glue gun, sponge etc http://www.essortment.com/hobbies/giftideasuniqu_sysz.htm
