An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Black And White Floral Pattern Background from PDP.
Source GDJ
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
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
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Prismatic Abstract Background Design No Black
Source GDJ
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen