A version without colours blended together to give a different look.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Prismatic Abstract Background Design No Black
Source GDJ
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Looks like an old rug or a computer chip.
Source Patutin Sergey
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A repeating background with a look of paper. I have added some changes to PatCreator. Now you can share your designs by submitting them to a new gallery section. Start by clicking Edit with PatCreator above.
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo