Free images results:

Stool pictures, stock photos and images


Rest Stock Photography
Author: Photopaul
Bench Stock Photos
Author: Allein

Also, here are some commercial RF-licensed images that match your search criteria:  
Stool Royalty Free Stock Image
Author: Stillfx
Stool Stock Images
Author: Restyler

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