Sort of reminds me of those old house wallpapers.
Source Tish
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A heavy hitter at 400x400px, but lovely still.
Source Breezi
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
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 a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous