The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Seamless Prismatic Geometric Pattern With Background
Source GDJ
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Inspired by a pattern found in 'A General History of Hampshire, or the County of Southampton, including the Isle of Wight', Bernard Woodwood, 1861
Source Firkin
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin