It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Element of beach pattern with background.
Source Rones
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
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 slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Classic 45-degree pattern, light version.
Source Luke McDonald
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green