Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
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
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Prismatic Abstract Background Design
Source GDJ
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
A black tile-able background with paper-like texture.
Source V. Hartikainen
The original enhanced with one of Inkscapes's filters.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Prismatic Groovy Concentric Background 4
Source GDJ
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen