It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
A nice and simple white rotated tile pattern.
Source Another One
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
A new one called white wall, not by me this time.
Source Yuji Honzawa
"Beige Stone", Tileable Texture.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using 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
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
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Colour version of the original pattern.
Source Firkin
A seamless paper background colored in pale yellow.
Source V. Hartikainen
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee