It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Tiny circle waves, almost like the ocean.
Source Sagive
Sometimes you just need the simplest thing.
Source Fabricio
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
Seamless Light Background Texture.
Source V. Hartikainen
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
From an image on opengameart.org shared by rubberduck.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
To get the tile this is made up from 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
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
You may use it as is, or modify it as you like.
Source V. Hartikainen
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin