Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Tile-able Dark Brown Wood Background. Feel free to use it as a background image in your designs or somewhere on the web. By the way, the color seems to be close to Coffee Brown.
Source V. Hartikainen
Tiny circle waves, almost like the ocean.
Source Sagive
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
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
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Dark blue concrete wall with some small dust spots.
Source Atle Mo
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
A seamless texture of black leather. I think it will look best when used in headers, footers or sidebars.
Source V. Hartikainen
A cute x, if you need that sort of thing.
Source Juan Scrocchi
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba