Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
This one is amazing, truly original. Go use it!
Source Viahorizon
A version without colours blended together to give a different look.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Prismatic Abstract Geometric Background 2
Source GDJ
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee