Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
More in the paper realm, this time with fibers.
Source Jorge Fuentes
The image is a seamless pattern of a fishnet.
Source Yamachem
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Prismatic Polyskelion Pattern No Background
Source GDJ
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Prismatic Chevrons Pattern 5 With Background
Source GDJ
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin