From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Prismatic Polka Dots Mark II No Background
Source GDJ
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Fix side and a seamless pattern formed from circles.
Source SliverKnight
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen