The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Colorful Floral Background No Black
Source GDJ
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek