Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Looks like an old rug or a computer chip.
Source Patutin Sergey
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk