People be claiming that "it's just not possible to have a UI toolkit that's both reliable and themeable outside of core OS styles" and yet none of them ever seem to mention the XP Zune theme which did precisely that
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For those not familiar: the Zune theme was a theme released by Microsoft for Windows XP, to promote their (ultimately failed) line of MP3 players.
Crucially, it was released late, relatively obscure, and most developers wouldn't have known about its existence. From a QA perspective, it effectively functioned as a third-party theme despite being published by Microsoft.
@Rairii Feel like that's maybe a bit late to the party for most people :p
@joepie91 true, but it IS possible
@joepie91 and now the private key for NT5.x theme signing has been leaked, you don't even need uxtheme patches anymore for third party themes on XP