Checkerboard
From Valve Developer Community
Checkerboard.bmp
This bitmap file used to be included in the Source SDK and on the Valve-erc to aid in UV mapping procedures. However, for some reason it is not included anymore, and seems to have disappeared from the internet. Through many days and aspirin bottles, I've finally found it again for new users that struggle to find this long lost file.
A download link is currently avalable for download at: http://www.mediafire.com/?9mmkzdn2j29
