Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Prismatic Abstract Geometric Background 4
Source GDJ
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A seamlessly tile-able grunge background image.
Source V. Hartikainen
From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous