Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
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
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin