The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Continuing the geometric trend, here is one more.
Source Mike Warner
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
A browner version of the original weathered fence texture.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
A new one called white wall, not by me this time.
Source Yuji Honzawa
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso