From an image on opengameart.org shared by rubberduck.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Prismatic Hypnotic Pattern No Background
Source GDJ
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin