Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Original minus the background
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Abstract Tiled Background Extended 6
Source GDJ
The image depicts polka dot seamless pattern.
Source Yamachem
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Prismatic Groovy Concentric Background No Black
Source GDJ
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin