Free images results:

Cobweb pictures, stock photos and images


Spider Stock Images
Author: Oanalualin
Spider Royalty Free Stock Photos
Author: Monkie

Also, here are some commercial RF-licensed images that match your search criteria:  
Cobweb Stock Photo
Author: Cukurs
Old cobweb Royalty Free Stock Images
Author: Ccat82
Cobweb Royalty Free Stock Photography
Author: Mimohe