A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß