Found 20 Panel CC0 textures in library

Acoustic Panel 1

Acoustic Panel 2

Acoustic Panel 3

Acoustic Panel 4

Acoustic Panel 5

Acoustic Panel 6

Acoustic Panel 7

Acoustic Panel 8

Concrete

Metal Plates 015 A

Metal Plates 015 B

Metal Plates 016 A

Metal Plates 016 B

Metal Plates 017 A

Metal Plates 017 B

Solar Panel 001

Solar Panel 002

Solar Panel 003

Solar Panel 004

Wood Frame 5