Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Prismatic Groovy Concentric Background 5
Source GDJ
A black tile-able background with paper-like texture.
Source V. Hartikainen
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Continuing the geometric trend, here is one more.
Source Mike Warner
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ