Free images results:
 

Thorn pictures, stock photos and images

 
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Thorn Stock Photo
Author: Andykazie
Iguana Royalty Free Stock Photography
Author: Michaf
Solitary man Stock Image
Author: 3pi
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Thorn Royalty Free Stock Photo
Author: Alptraum
Rose Thorn Royalty Free Stock Images
Author: Jgar
Thorn  Stock Image
Author: Tonnywu76
Thorn Stock Image
Author: Syaber
Big thorn Stock Photos
Author: Ankimo