A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
A floral background formed from numerous clones of flower 117.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Light and tiny, just the way you like it.
Source Rohit Arun Rao
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Retro Circles Background 4 No Black
Source GDJ
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen