There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Zero CC plastic pattern texture, photographed and made by me. CC0 *Note, this texture was on the perfectly smooth surface of a plastic shovel scraper, not sure how to call it. Plz coment if you know what its called.
Source Sojan Janso
A free seamless background pattern for use on websites.
Source V. Hartikainen
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin