Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Abstract Ellipses Background Grayscale
Source GDJ
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Alternative colour scheme for the original floral pattern.
Source Firkin
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin