The Chosen Ones

i.e. those web graphical design systems I support as documented in the CL/XSL codebook:

Preferred:

• Drupal 6 Zen Themes²
• Wikimedia skins (like this one EG).
• Support for adapting Art Quality single page designs, ¹: to a CMS was a design requirement of CL/XSL and PublicJobShop where you can work with the artists.

Also supported:

• Orbeon XForms with DCMS.
• Template World templates.
• WordPress themes.

A popular method of web development is to develop "mock-ups" with a given graphical treatment to be supported by backend software.
CL-XSL supports this for mockups using the above CSS templating and DCMS supported packages.
In a development process which is all of literate, considered, and (having gotten) real, a mock is essentially a pre-production version of the contracted thing.

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¹ In general, unless released under some license, these always require cooperation/permission of original author.
² My generic applications use Zen wireframes and an authenticated use can select any installed Zen theme.
³ cf. in particular The Chosen One whose style you can set.