Free images results:

Curve pictures, stock photos and images

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Bridge Royalty Free Stock Photography
Author: Jolin
Bike Park Royalty Free Stock Image
Author: Qmedia
Swan Royalty Free Stock Photos
Author: Gfadel
Pantheon Royalty Free Stock Photography
Author: Ebe
Swan Stock Images
Author: Gfadel
Bent tiles Stock Image
Author: Simple
Tower Stock Photography
Author: Mika5
Train Stock Photos
Author: Illreality
Black Hills Stock Photography
Author: Nitzu
Starlight Stock Photo
Author: Clarita
Swan Stock Photos
Author: Catcha
Pattern Royalty Free Stock Photography
Author: Ichtor
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Also, here are some commercial RF-licensed images that match your search criteria:  
Color curve Royalty Free Stock Photo
Author: Scusi

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