A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
White little knobs, coming in at 10x10px. Sweet!
Source Amos
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A seamless tessellation pattern. To get the tile this is formed from, select the pattern 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
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
This seamless light brown background texture resembles a wallpaper with vertical stripes. One way to use it is as a tiled background on web sites.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin