Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
A heavy hitter at 400x400px, but lovely still.
Source Breezi
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
A seamlessly tileable pink background texture.
Source V. Hartikainen
This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
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
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin