Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
Prismatic Groovy Concentric Background
Source GDJ
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
It’s big, it’s gradient—and it’s square.
Source Brankic1979
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4
Source GDJ
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi