The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
The base gradient edited so now more details are rendered.
Source Lazur URH
A seamless background texture of old cardboard.
Source V. Hartikainen
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
It’s big, it’s gradient—and it’s square.
Source Brankic1979
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin