Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Prismatic Groovy Concentric Background 5
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker