A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Abstract Tiled Background Extended 10
Source GDJ
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
Classic vertical lines, in all its subtlety.
Source Cody L
This one is amazing, truly original. Go use it!
Source Viahorizon