Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Looks like an old wall. I guess that’s it then?
Source Viahorizon
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
White circles connecting on a light gray background.
Source Mark Collins
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
This is a remix of "geometrical pattern 01".
Source Yamachem