In a pile of stuff destined for a thrift store, I rescued a bag of sea shells. I wasn't sure what I was going to do with them, because let's face it, there's a lot of really tacky sea shell art out there, but I knew I wanted to craft something. I saved a few of the prettiest shells and put the rest in some cardboard boxes to spray them silver (like you see at Pottery Barn and what not).
I sprayed them with my Rustoleum Metallic Silver spray paint. I applied two light coats on the tops. I left them outside for about an hour in between coats.
Then I flipped them over and put a good coat on the bottom side. They were pretty well covered at that point. I set most of them aside to finish curing inside. Some of the shells had more nooks and crannies and needed to be sprayed again to get into all of the little corners.
I let them dry inside overnight and then put them into a glass vase. I picked up this one (which is about 10 inches tall) at Wal-mart for only $3.99. I think it looks great on my mantel!