It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Abstract Geometric Background 5
Source GDJ
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A blue gray fabric-like texture for websites. An yet another fabric-like texture. It has subtle vertical and diagonal stripes to it.
Source V. Hartikainen
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
A floral background formed from numerous clones of flower 117.
Source Firkin
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
An alternative colour scheme for the original background.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin