A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Prismatic Floral Background No Black
Source GDJ
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
A background pattern with a look of rough fabric.
Source V. Hartikainen
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury