This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Wasn't satisfied with the original's colouring. Too much component transfer and colormatrixes yet the results are lacking a bit. So this time it is a simple black to transparent fade, making it possible remixing easily once there will be other blending modes supported as well. Probably in inkscape 0.92.
Source Lazur URH
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin