Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Tiny circle waves, almost like the ocean.
Source Sagive
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
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
An alternative colour scheme for the original background.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A black tile-able background with paper-like texture.
Source V. Hartikainen