Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
The image is a design of blue glass.How about using it as background image?
Source Yamachem
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Prismatic Triangular Background Design Mark II 5
Source GDJ
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
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
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Neat little photography icon pattern.
Source Hossam Elbialy
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Geometric triangles seem to be quite hot these days.
Source Pixeden
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin