CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Dark blue concrete wall with some small dust spots.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A background pattern with a look of rough fabric.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin