Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Prismatic Groovy Concentric Background 5
Source GDJ
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
A seamless pattern formed from background pattern 102
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
A version without colours blended together to give a different look.
Source Firkin