A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
A textured blue background pattern with vertical stripes.
Source V. Hartikainen