Sort of reminds me of those old house wallpapers.
Source Tish
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A white version of the very popular linen pattern.
Source Ant Ekşiler
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
Abstract Tiled Background Extended 8
Source GDJ
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin