Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
There are many carbon patterns, but this one is tiny.
Source Designova
Classic 45-degree pattern, light version.
Source Luke McDonald
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle 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