A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
A version without colours blended together to give a different look.
Source Firkin
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
A bit strange this one, but nice at the same time.
Source Diogo Silva
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
This light yellow background pattern consists of an irregular pattern of spots. Here's a light background pattern with yellowish tint.
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Remixed from a drawing that was uploaded to Pixabay by DavidZydd
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis