This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
A free seamless background with pink spots.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A free background pattern with abstract green tiles.
Source V. Hartikainen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin