A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Seamless Green Tile Background
Source V. Hartikainen
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Retro Circles Background 7 No Black
Source GDJ
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen