From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Prismatic Abstract Background Design
Source GDJ
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Sharp pixel pattern, just like the good old days.
Source Paridhi
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
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
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
Prismatic Polyskelion Pattern No Background
Source GDJ
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner