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
Light and tiny, just the way you like it.
Source Rohit Arun Rao
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A white version of the very popular linen pattern.
Source Ant Ekşiler
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Might not be super subtle, but quite original in its form.
Source Alex Smith
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin