To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Colorful Floral Background 3 No Black
Source GDJ
Sort of reminds me of those old house wallpapers.
Source Tish
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Retro Circles Background 8 No Black
Source GDJ
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton