Well, if you haven't already, you can check here:
https://github.com/StormFX/Masque/wiki/Skin-List
It's a list of the skin's that are (were?) available for Masque (including out-of-date or incompatible [with Masque] skin's. I don't think it's complete, but, there's a bunch of 'em.
It could also be a custom Masque skin. They aren't really that hard to make. By-the-way, the link and screenie are the same picture.
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Ahhhh, the vagueries of the aging mind. Wait.... What was I saying?
Carbonite <----- GitHub main module (Maps ONLY) download link. The other modules are also available on GitHub.
Carbonite-CLASSIC<----- GitHub link to Carbonite Classic. Thanks to ircdirk for this!