This was formed by distorting an image of a background on Pixabay.
Source Firkin
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin