A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
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
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen