A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Prismatic Abstract Geometric Background 5
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Retro Circles Background 4 No Black
Source GDJ
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Alternative colour scheme to the original.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
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
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin