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
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten