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Royalty-Free Blackboard Photos, minimum size: 5k, dominant color: cyan
6016x4016
assorted pencils on blue surface
Public Domain
5184x3240
red and green tennis court
Public Domain
5184x3456
green chalkboard with chalks
Public Domain
6000x4000
The Shark Men Squad
Public Domain
5760x3840
man in yellow cap holding chalk
Public Domain
5148x3432
Small flowers, pencils and other things on wood
Public Domain