This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Geometric triangles seem to be quite hot these days.
Source Pixeden
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki