Free images results:
 

Mortar pictures, stock photos and images

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