It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Background pattern originally a PNG drawn in Paint.net
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
This could be a hippy vintage wallpaper.
Source Tileable Patterns
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
An alternative colour scheme to the original seamless pattern.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin