This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
I’m not going to lie – if you submit something with the words Norwegian and Rose in it, it’s likely I’ll publish it.
Source Fredrik Scheide
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Sometimes you just need the simplest thing.
Source Fabricio
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
A seamless background texture of old cardboard.
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen