A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Abstract Ellipses Background Grayscale
Source GDJ
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Seamless Light Background Texture.
Source V. Hartikainen
Background formed from the original with an emboss effect.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
Prismatic Triangular Background Design Mark II 5
Source GDJ
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso