Number five from the same submitter, makes my job easy.
Source Dima Shiper
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
The image depicts a tiled seamless pattern.The tile represents four leaves aligned every 90 ° , which may look like a bird or a dragon .The original leaf design is from a Japanese old book.
Source Yamachem
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin