Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Prismatic Snowflakes Pattern No Background
Source GDJ
Geometric triangles seem to be quite hot these days.
Source Pixeden
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
Colour version of the original pattern.
Source Firkin
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive