To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
The image is a seamless pattern of a fishnet.
Source Yamachem
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
A repeating background with wood/straw like texture.
Source V. Hartikainen
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Looks like an old rug or a computer chip.
Source Patutin Sergey
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen