A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
This one has rusty dark brown texture.
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Sharp but soft triangles in light shades of gray.
Source Pixeden
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Prismatic Basic Pattern 2 No Background
Source GDJ
You know you love wood patterns, so here’s one more.
Source Richard Tabor
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
Sort of reminds me of those old house wallpapers.
Source Tish