I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
This one needs to be used in small areas; you can see it repeat.
Source Luca
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin