You may use it as is, or modify it as you like.
Source V. Hartikainen
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom