Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers