Seamless Light Background Texture.
Source V. Hartikainen
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
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
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Prismatic Groovy Concentric Background
Source GDJ
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Abstract Ellipses Background Grayscale
Source GDJ
Prismatic Groovy Concentric Background 2
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin