Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Lovely pattern with splattered vintage speckles.
Source David Pomfret
This is the remix of "plant pattern 02".I changed the object color to white and the BG to purple.The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:jp.pinterest.com/pin/500744052301423641/
Source Yamachem
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Background pattern originally a PNG drawn in Paint.net
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin