I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
From an image on opengameart.org shared by rubberduck.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous