It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Colorful Floral Background 3 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Abstract Background Design No Black
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin