This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
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
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
This was formed by distorting an image of a background on Pixabay.
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Pattern formed from simple shapes. Black version.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin