From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Sometimes you just need the simplest thing.
Source Fabricio
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Alternative colour scheme for the original floral pattern.
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
Prismatic Triangular Background Design Mark II 5
Source GDJ
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen