Geometric triangles seem to be quite hot these days.
Source Pixeden
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
A bit strange this one, but nice at the same time.
Source Diogo Silva
A free background pattern with abstract green tiles.
Source V. Hartikainen
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin