Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Prismatic Curved Diamond Pattern No Background
Source GDJ
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Prismatic Abstract Geometric Background 2
Source GDJ
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Abstract Tiled Background Extended 8
Source GDJ
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
More in the paper realm, this time with fibers.
Source Jorge Fuentes
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
The original enhanced with one of Inkscapes's filters.
Source Firkin