Just like your old suit, all striped and smooth.
Source Alex Berkowitz
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A version without colours blended together to give a different look.
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
This could be a hippy vintage wallpaper.
Source Tileable Patterns
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
Background formed from the original with an emboss effect
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
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
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen