Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A free pink background pattern.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen