Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A new take on the black linen pattern. Softer this time.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Hexagonalist Pattern No Background
Source GDJ
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec