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
Prismatic Geometric Pattern Background 2
Source GDJ
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Prismatic Basic Pattern 2 No Background
Source GDJ
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin