From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
You may use it as is, or modify it as you like.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Sharp pixel pattern, just like the good old days.
Source Paridhi
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf