Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
Psychedelic Geometric Background No Black
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Embossed lines and squares with subtle highlights.
Source Alex Parker
Tiny dark square tiles with varied color tones.
Source Gre3g
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Japanese looking fish scale pattern.
Source Ian Soper
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin