White circles connecting on a light gray background.
Source Mark Collins
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Classic vertical lines, in all its subtlety.
Source Cody L
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Retro Circles Background 8 No Black
Source GDJ
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin