- Create stylesheet(s) for each different style. Note that each stylesheet is added to the existing set of default stylesheets.
- Add a line to your theme's info file like
styleswitcher[css][Style 2] = css/style2.css
where "Style 2" is the title associated with you style, and css/style2.css is the location of the stylesheet, relative to the theme's path.
That's it. The module will present a block with links for each of these styles. It is much like the color module; in order to use it you must have the module enabled AND use a theme that implements it.
To read more about how alternate stylesheets are implemented in browsers, see this *old* A List Apart article.
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