Not sure about snapon skins... I have a sticker skin for my E1705, got it as part of a special promotion thing I got in my e-mail. The site is http://www.dellskin.com but I think it's only open to people who have been invited through e-mail. Unfortunately they don't show their selection either, but it's a pretty big selection.
I haven't heard of a snap-on skin though, unless you're talking about the red and black cover choices of the XPS laptops.
Yes I was talking about the stick on ones, and the red dragon was one of the designs I considered. I ended up getting the "3D Experience" one though, it looks pretty cool but I like the silver look of my E1705. Still, I have the skin, and I don't feel bad about it because I got it for free. When I get bored with the silver or the top gets all scratched up, I'll stick the skin on.