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
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Green Background Pattern
Source V. Hartikainen
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
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 'Less Black than we're painted', James Payn, 1884.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green