I have seen this on both the UBBCentral site and here.
One problem I have seen is where people post a link to their site with the style. Okay, great you can link to the site and see what it really looks like, even interact with it, but what happens a week or month down the road when you change it?
This is what I have seen. The link no longer represents what the wrapper looks like.
The better option IMHO is to include a jpg (image) file. If you still want to post the link, go for it, but please also post the jpg file for those of us that want to view it sometime down the road and you have either removed or modified the style on your site or worse, your site isn't even running any more.