A seamless background of warped stripes on paper.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
A comeback for you: the popular Escheresque, now in black.
Source Patten
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
The image is a design of blue glass.How about using it as background image?
Source Yamachem
Prismatic Geometric Pattern Background
Source GDJ
Alternative colour scheme for the original floral pattern.
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios