Creating skins that adhere to the WCAG rules about color contrast certainly is a good idea - and we highly value the readability of the skins - the Sitefinity skin has a great contrast (black on white).
Changing control properties based on the skin name, however, is not intuitive, and could be considered a bug if one were to create a skin with the same name, not to say if there are such skins already. There are properties like the AccessibilityMode property
All the best,
the Telerik team
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