The classic notebook paper with horizontal stripes.
Source Are Sundnes
Prismatic Curved Diamond Pattern No Background
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Prismatic Basic Pattern 2 No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Old China with a modern twist, take two.
Source Adam Charlts
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem