Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
It’s big, it’s gradient—and it’s square.
Source Brankic1979
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
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
From an image on opengameart.org shared by rubberduck.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
CC0 and seamless wellington boot pattern.
Source SliverKnight
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Kaleidoscope Prismatic Abstract No Background
Source GDJ