This was formed by distorting an image of a background on Pixabay.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
Prismatic Groovy Concentric Background 3
Source GDJ
Lovely pattern with splattered vintage speckles.
Source David Pomfret
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen