I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
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
Looks like an old wall. I guess that’s it then?
Source Viahorizon
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
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
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso