Sometimes you just need the simplest thing.
Source Fabricio
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Prismatic Groovy Concentric Background 2
Source GDJ
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This was formed by distorting an image of a background on Pixabay.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo