Colourful background achieved with gradient fills.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin