This one is amazing, truly original. Go use it!
Source Viahorizon
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
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Sort of reminds me of those old house wallpapers.
Source Tish
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Prismatic Geometric Pattern Background No Black
Source GDJ
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf