Free images results:
 

Stool pictures, stock photos and images

 
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Rest Stock Photography
Author: Photopaul
Bench Stock Photos
Author: Allein
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Stool Royalty Free Stock Image
Author: Stillfx
Stool Stock Photo
Author: Atman
Stool Stock Photography
Author: Pichunter
Stool Stock Photo
Author: Atman
Stool Stock Photo
Author: Steamroller
Stool Stock Images
Author: Atman