This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Pattern formed from simple shapes. Black version.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Prismatic Groovy Concentric Background 5
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
This was formed by distorting an image of a background on Pixabay.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec