Geometric triangles seem to be quite hot these days.
Source Pixeden
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs