Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem