Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Similar to original, but without gaps in between the arrows. This seamless pattern was created from a rectangular tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ