Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A black tile-able background with paper-like texture.
Source V. Hartikainen
Black And White Floral Pattern Background Inverse
Source GDJ
The image is a seamless pattern of a fishnet.
Source Yamachem
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Colorful Floral Background No Black
Source GDJ
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Groovy Concentric Background 3
Source GDJ
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin