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
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Just like the black maze, only in light gray. Duh.
Source Peax
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne