I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
A seamless pattern with green and yellow diagonal lines on top of a white dotted background.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A new take on the black linen pattern. Softer this time.
Source Atle Mo
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
An alternative colour scheme to the original seamless pattern.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen