This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
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
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A floral background formed from numerous clones of flower 117.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
A pale olive green background with a seamless texture.
Source V. Hartikainen
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Fix and cc0 to get the tile this is based on.
Source SliverKnight
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim