Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Seamless Prismatic Geometric Pattern With Background
Source GDJ
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
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
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
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
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Abstract Background Design
Source GDJ
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek