Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
Classic 45-degree pattern, light version.
Source Luke McDonald
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
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
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Prismatic Abstract Line Art Pattern Background
Source GDJ
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo