Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A bit strange this one, but nice at the same time.
Source Diogo Silva
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
This was formed by distorting an image of a background on Pixabay.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
More in the paper realm, this time with fibers.
Source Jorge Fuentes
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
Source Firkin
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Looks like an old rug or a computer chip.
Source Patutin Sergey