Free images results:

Mortar pictures, stock photos and images


Wall Stock Images
Author: Monkie
Background Stock Images
Author: Atee83
Backgorund Stock Images
Author: Atee83
Background Royalty Free Stock Photo
Author: Atee83
Log Cabin Stock Images
Author: Bandu

Also, here are some commercial RF-licensed images that match your search criteria:  
Mortar Royalty Free Stock Image
Author: Samuvel

Explore more commercial options: More Mortar Stock Illustrations & Vectors | More Mortar Stock Video Footage