It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Prismatic Triangular Background Design Mark II 5
Source GDJ
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
A white version of the very popular linen pattern.
Source Ant Ekşiler
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
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
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Retro Circles Background 4 No Black
Source GDJ
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
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
This is a remix of "geometrical pattern 01".
Source Yamachem
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin