Thanks for pointing that out, I'll upload one soon. For now, if you open dev tools on the Modulz site, go to the html element and change the "phlat" class to "glossy". Then you'll see the skeuo buttons.

Here's an image of the phlat button and the skeuo buttons side by side.

http://i.imgur.com/3fDqmbz.png

Modulz ships with both styles anyway, so no need to worry :)