I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Prismatic Polka Dots 3 No Background
Source GDJ
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Prismatic Hypnotic Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
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
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen