The only problem is that all these themes are the same right now (or are ignored).
It looks like they are being overridden by the default stylesheet.
Of course the latter are only active for users that have logged in.
Firefox and most of the other decent browsers (IE does not fall into this category) offer the option of selectable style sheets that should work any time. All the web page authors have to do is include one extra line of text in the 'head' section to implement each alternative.
Here's an example from a site that most web page authors should visit. (
http://www.cameratim.com/personal/soapbox/morons-in-webspace)
<link rel="stylesheet" type="text/css" href="/styles/default.css" title="cameratim.com">
<link rel="alternate stylesheet" type="text/css" href="/styles/plain.css" title="plain">
<link rel="alternate stylesheet" type="text/css" href="/styles/sore-eyes.css" title="sore eyes">
<link rel="alternate stylesheet" type="text/css" href="/styles/pastels.css" title="pastels">
<link rel="alternate stylesheet" type="text/css" href="/styles/puce.css" title="puce">
<link rel="alternate stylesheet" type="text/css" href="/styles/outrageous.css" title="outrageous">
<link rel="alternate stylesheet" type="text/css" href="/styles/stupid.css" title="stupid">
<link rel="alternate stylesheet" type="text/css" href="/styles/tiny.css" title="tiny text">When using Firefox you implement these in the 'View | Page Style' menu.
Don