Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A version without colours blended together to give a different look.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
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
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Sharp pixel pattern, just like the good old days.
Source Paridhi
Prismatic Curved Diamond Pattern No Background
Source GDJ
Embossed lines and squares with subtle highlights.
Source Alex Parker
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin