A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
From an image on opengameart.org shared by rubberduck.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Seamless Dark Grunge Texture. Here's a new grunge texture for use as a background.
Source V. Hartikainen
Tiny circle waves, almost like the ocean.
Source Sagive
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Prismatic Abstract Geometric Background 3
Source GDJ
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Prismatic Curved Diamond Pattern No Background
Source GDJ