This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Just like the black maze, only in light gray. Duh.
Source Peax
From an image on opengameart.org shared by rubberduck.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
This is sort of fresh, but still feels a bit old school.
Source Martuchox
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin