Free images results:
 

Mould pictures, stock photos and images

 
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Garage Royalty Free Stock Photo
Author: Skycam
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Mould pile Royalty Free Stock Image
Author: Aeolos
Mould Royalty Free Stock Image
Author: Matteo69
Mould Stock Photo
Author: Baloncici