I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Black brick wall pattern. Brick your site up!
Source Alex Parker
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
CC0 and seamless wellington boot pattern.
Source SliverKnight
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A repeating background with wood/straw like texture.
Source V. Hartikainen
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Just a nice looking textured pattern with faded blue stripes. Well, that's it for today... one background a day, as usual.
Source V. Hartikainen
Abstract Tiled Background Extended 10
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen