Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Background pattern originally a PNG drawn in Paint.net
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
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
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen