Looks like an old wall. I guess that’s it then?
Source Viahorizon
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Alternative colour scheme for the original floral pattern.
Source Firkin
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
A floral background formed from numerous clones of flower 117.
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
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
You may use it as is, or modify it as you like.
Source V. Hartikainen
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin