Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A new one called white wall, not by me this time.
Source Yuji Honzawa
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Original seamless pattern with an Inkscape filter.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Colour version of the original pattern.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks