Free images results:
 

Playground pictures, stock photos and images

 
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Seesaw Royalty Free Stock Photos
Author: Jyothi
Ferriswheel Royalty Free Stock Photo
Author: Klikk
Playing Stock Photography
Author: Eleandra
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Playground Stock Photos
Author: Py2000
Playground Stock Photography
Author: Py2000
Playground Stock Photography
Author: Py2000
Playground Stock Photos
Author: Tony1