A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
The original enhanced with some gradients.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Abstract Tiled Background Extended 6
Source GDJ
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Psychedelic Geometric Background No Black
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen