I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A free seamless background with pink spots.
Source V. Hartikainen
A seamless background pattern with impressed gray dots.
Source V. Hartikainen