Not sure about Poser 12, but Poser 11 ships with what you want. An old-school Poser 10 default scene. It's found under: Library | Scene | Poser 11 Environments | Poser 10 Workspace.

Here's a script to load it, and select Ground ready for coloring. I guess in Poser 12 you just change "Poser 11" to "Poser 12":

import poser

scene = poser.Scene()

# Close current document.
poser.CloseDocument(0)

# Open the old-school Poser 10 default scene.
poser.OpenDocument(r"C:|Users|Public|Documents|Poser 11 Content|Runtime|Libraries|Scene|Poser 11 Environments|Poser 10 Workspace.pzz")

# Select the GROUND
scene.SelectActor(scene.Actor("GROUND"))

scene.DrawAll()

Change | to backslashes.

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Learn the Secrets of Poser 11 and Line-art Filters.