A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Abstract Tiled Background Extended 6
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
This is the remix of "Tileable Wave Pattern 2" uploaded by "Arvin61r58".Thanks.I added a wire-mesh fence seamless pattern as a lower layer.
Source Yamachem
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Seamless Light Background Texture.
Source V. Hartikainen
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Light and tiny, just the way you like it.
Source Rohit Arun Rao
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
An alternative colour scheme to the original seamless pattern.
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
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton