A few weeks ago we stopped at a cake supply store on our vacation. My daughter immediately found these giant marshmallows and purchased them for her grandfather.
http://www.candywarehouse.com/marshmallows.html

I was just searching for them and also found this website with some cute decorating ideas.
http://www.ajcake.com/marsh.html

Those are cute,thanx for sharing

Wow, those are huge, I love 'em! Thanks for sharing