Free images results:

Line pictures, stock photos and images

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Roof Line Stock Photos
Author: Alain
Thin line Royalty Free Stock Photography
Author: Back_me
Bubbles Stock Photography
Author: Kazper
Crow Stock Image
Author: Judy
Gondolas Royalty Free Stock Photography
Author: Cdcramer
Repeats Stock Images
Author: Clarita
Tracks Royalty Free Stock Images
Author: Ichtor
I'm hooked! Stock Photography
Author: Crp
Fishing Royalty Free Stock Photo
Author: Gfadel
Medication Stock Photography
Author: Prawny
Couple Stock Photos
Author: Prawny
Rolling Stock Photo
Author: Bsilvia
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Also, here are some commercial RF-licensed images that match your search criteria:  
Zip-line Royalty Free Stock Photos
Author: Goodolga

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