ah ok you search the source.
But it's just a glass texture with dark lines paints on it.
And maybe he didn't use a glass texture for base, but have just create the glass texture with Photoshop's tools like 'Distort' => 'Diffuse Glow' or 'Glass'.
The only texture that I have found similar is : http://www.cgtextures.com/texview.php?id=16600&PHPSESSID=19lcdkgvd7i63jtn1e9poeroq0
It is just a glass texture with dark lines paints on it, yes, but it is something I can't make myself.
However, it is unlikely he made it from scratch since so far I've been able to find most of his textures as resources in one place or another, some textures are even from existing packs and totally un-edited, so I'm guessing this one should also be somewhere, maybe only in a bit different state than this one.