Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
White handmade paper pattern with small bumps.
Source Marquis
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
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A comeback for you: the popular Escheresque, now in black.
Source Patten
From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
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
Just a nice looking textured pattern with faded blue stripes. Well, that's it for today... one background a day, as usual.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom