Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
Geometric triangles seem to be quite hot these days.
Source Pixeden
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 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
A seamless paper background colored in pale yellow.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman