This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Green Background Pattern
Source V. Hartikainen
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Retro Circles Background 4 No Black
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
A free seamless background with pink spots.
Source V. Hartikainen
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen