Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
From an image on opengameart.org shared by rubberduck.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin