Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Abstract Geometric Background 3
Source GDJ
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
Background pattern originally a PNG drawn in Paint.net
Source Firkin