If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This light yellow background pattern consists of an irregular pattern of spots. Here's a light background pattern with yellowish tint.
Source V. Hartikainen
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
It’s big, it’s gradient—and it’s square.
Source Brankic1979
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo