A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
This is a hot one. Small, sharp and unique.
Source GraphicsWall
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Seamless Prismatic Geometric Pattern With Background
Source GDJ
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
This one is amazing, truly original. Go use it!
Source Viahorizon
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
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
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward