Free images results:
 

Gravel pictures, stock photos and images

 
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Wine on road Royalty Free Stock Image
Author: Mhd
River Stock Photography
Author: Red2000
Pebbles Stock Photography
Author: Ichtor
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Gravel Royalty Free Stock Photos
Author: Bodhichita
Gravel Royalty Free Stock Images
Author: Scrambled