An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A version without colours blended together to give a different look.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
An alternative colour scheme for the original seamless texture formed from an image on Pixabay.
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso