Background pattern originally a PNG drawn in Paint.net
Source Firkin
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
The classic notebook paper with horizontal stripes.
Source Are Sundnes
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
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
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
CC0 and seamless wellington boot pattern.
Source SliverKnight
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
Element of beach pattern with background.
Source Rones
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
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