Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
A seamless paper background colored in pale yellow.
Source V. Hartikainen
Prismatic Snowflakes Pattern No Background
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Prismatic Groovy Concentric Background No Black
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
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
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Alternative colour scheme to the original.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin