A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin