Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
A seamless tessellation pattern. To get the tile this is formed from, select the pattern 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
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Floral Background No Black
Source GDJ
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc