Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
This one is amazing, truly original. Go use it!
Source Viahorizon
Prismatic Abstract Geometric Background 4
Source GDJ
A nice and simple white rotated tile pattern.
Source Another One
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica