http://archive.tf2maps.net/showthread.php?t=14789

Expanses into the southern hemisphere have lead TF Industries to discover a new material for use in building, heating, and top secret concealing!

We've heard the local inhabitants refer to it as "adobe." And from that, we've come to the realization that the material is capable of many artistic things, so we will give you, the customer, a set of adobe for your very own top secret concealing!

Offer limited to northern hemisphere, all orders to southern hemisphere locations will instead be replaced with a letter informing you to look outside. We know you already have enough of it.
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Void's Texturefest 2010

A set of Adobe materials as requested by purequaternion.

Seventeenth of many Texturefest 2010 uploads.