A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
White circles connecting on a light gray background.
Source Mark Collins
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
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
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Continuing the geometric trend, here is one more.
Source Mike Warner
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
The image is a design of blue glass.How about using it as background image?
Source Yamachem
Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A light gray wall or floor (you decide) of concrete.
Source Atle Mo