Free images results:
 

Circle pictures, stock photos and images

 
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Background Stock Image
Author: Hudruk
CD's Royalty Free Stock Photography
Author: Filmwork_52
Frame Stock Photos
Author: Easyshutter
Keys Stock Photography
Author: Dark3d
Bokeh Royalty Free Stock Photos
Author: Zhangyh
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Fire circle Royalty Free Stock Image
Author: Jagcz

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