This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
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
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Prismatic Polka Dots Mark II No Background
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Green Web Background, Seamless tile.
Source V. Hartikainen
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
Background formed from the original with an emboss effect
Source GDJ
Seamless Green Tile Background
Source V. Hartikainen
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
White little knobs, coming in at 10x10px. Sweet!
Source Amos
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem