Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Abstract Line Art Pattern Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ