You may use it as is, or modify it as you like.
Source V. Hartikainen
From an image on opengameart.org shared by rubberduck.
Source Firkin
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
This one needs to be used in small areas; you can see it repeat.
Source Luca
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Prismatic Geometric Pattern Background
Source GDJ
This one has rusty dark brown texture.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
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
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Prismatic Chevrons Pattern 5 With Background
Source GDJ
"Beige Stone", Tileable Texture.
Source V. Hartikainen
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin