Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov