Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A seamless paper background colored in pale yellow.
Source V. Hartikainen
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Retro Circles Background 5 No Black
Source GDJ
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim