Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Otis Ray Redding was an American soul singer-songwriter, record producer, arranger, and talent scout. So you know.
Source Thomas Myrman
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Abstract Ellipses Background Grayscale
Source GDJ
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Seamless Prismatic Geometric Pattern With Background
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
A seamlessly tileable pink background texture.
Source V. Hartikainen
Prismatic Abstract Geometric Background 3
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee