Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
It’s big, it’s gradient—and it’s square.
Source Brankic1979
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
Almost like little fish shells, or dragon skin.
Source Graphiste
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
White circles connecting on a light gray background.
Source Mark Collins
Prismatic Groovy Concentric Background 4
Source GDJ
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin