Free images results:
 

Crack pictures, stock photos and images

 
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Cracks 2 Royalty Free Stock Image
Author: Viking
Crayfish Royalty Free Stock Photography
Author: Kuksin
Canalization Royalty Free Stock Photography
Author: Mkoh
Knot Royalty Free Stock Photos
Author: Jxpfeer
Shells Stock Photography
Author: Mika5
Bark Stock Photo
Author: Ichtor
Glacial Ice Royalty Free Stock Images
Author: Mhd
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Crack Stock Photos
Author: Yudesign
Crack Stock Image
Author: Bradcalkins
Ice crack Stock Photography
Author: Staphy
Ice crack Stock Photography
Author: Staphy