From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Colorful Floral Background 3 No Black
Source GDJ
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Just like the black maze, only in light gray. Duh.
Source Peax
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo