Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Triangular Background Design Mark II 5
Source GDJ
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
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
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Prismatic Hypnotic Pattern 2 No Background
Source GDJ