Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Looks like an old rug or a computer chip.
Source Patutin Sergey
Geometric triangles seem to be quite hot these days.
Source Pixeden
Sometimes you just need the simplest thing.
Source Fabricio
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady