An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
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
Lovely pattern with splattered vintage speckles.
Source David Pomfret
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
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
The image is a design of blue glass.How about using it as background image?
Source Yamachem
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin