A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A seamless paper background texture colored in pale yellow. This seamless texture is ideal for those who need a yellow background image for their website. The texture resembles paper.
Source V. Hartikainen
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
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
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen