Is the map "underlay" available?

[Xenomorph]

Hi, I'm wondering if the "underlay" that vaguely shows farm fields etc as a background on the game maps has been made available for creating new maps. It's adds a great feel to the game so if anyone could direct me I'd appreciate it. Happy Holidays!

[CapnDarwin]

I'll leave that for William to answer. I'm not sure what he is using or how it is applied.

[Stimpak]

The "Farm" underlay is attached to this post, Courtesy of William.