The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
White little knobs, coming in at 10x10px. Sweet!
Source Amos
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Prismatic Hexagonalist Pattern No Background
Source GDJ
A seamless web texture of "green stone".
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin