As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
"Beige Stone", Tileable Texture.
Source V. Hartikainen
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Groovy Concentric Background 5
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
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
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin