Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Repeating squares overlapping.
Source Pete Fecteau
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Not sure what this is, but it looks good!
Source Josh Green
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
As simple as it gets: gray lines crossing.
Source Erikdel
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Looks like an old rug or a computer chip.
Source Patutin Sergey
Prismatic Hypnotic Pattern No Background
Source GDJ
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen