The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
A seamlessly tile-able grunge background image.
Source V. Hartikainen
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
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Seamless Light Background Texture.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin