An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Alternative colour scheme for the original floral pattern.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Psychedelic Geometric Background No Black
Source GDJ
A floral background formed from numerous clones of flower 117.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin