Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Classic vertical lines, in all its subtlety.
Source Cody L
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin