I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Old China with a modern twist, take two.
Source Adam Charlts
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Might not be super subtle, but quite original in its form.
Source Alex Smith
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Oh yes, it happened! A pattern in full color.
Source Atle Mo
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
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ