Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Prismatic Abstract Geometric Background 4
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Abstract Tiled Background Extended 12
Source GDJ
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
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
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Tiny circle waves, almost like the ocean.
Source Sagive
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin