A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Sort of reminds me of those old house wallpapers.
Source Tish
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
A comeback for you: the popular Escheresque, now in black.
Source Patten
Seamless Light Background Texture.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
A free background pattern with abstract green tiles.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
Embossed lines and squares with subtle highlights.
Source Alex Parker
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
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Prismatic Groovy Concentric Background 4 No Black
Source GDJ