This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Psychedelic Geometric Background No Black
Source GDJ
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
A repeating background with wood/straw like texture.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker