One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Prismatic Groovy Concentric Background 5
Source GDJ
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
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
Colorful Floral Background 3 No Black
Source GDJ
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
A comeback for you: the popular Escheresque, now in black.
Source Patten
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
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 edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß