From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod