Decorative divider 277 #1906
 Colorful  CC 0

Vector version of a png that was uploaded to Pixabay by pencilparker

Source Firkin

 More Textures
Shapes pattern 2 #2241
 Red  CC 0

A background made up of shapes.

Source Firkin

Atomicfrogs #1670
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Shine Dotted #711
 Grid  CC BY-SA 3.0

Tiny shiny dots all over your screen.

Source mediumidee

Dark Brown Timber Wall Texture #874
 Wood  CC BY-SA 3.0

A free seamless background texture of "timber wall" (colored in dark brown).

Source V. Hartikainen

[email protected] #126
 Dark  CC BY-SA 3.0

And some more testing, this time with Seamless Studio. It’s Robots FFS!

Source Seamless Studio

Green Fibers #91
 Dark  CC BY-SA 3.0

The green fibers pattern will work very well in grayscale as well.

Source Matteo Di Capua

Diamond pattern 2 (colour 5) #2264
 Blue  CC 0

From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Page ornament 22 #2358
 Dark  CC 0

From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.

Source Firkin

Background pattern 224 (colour 5) #2338
 Colorful  CC 0

To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

Wide [email protected] #700
 Wall  CC BY-SA 3.0

Simple wide squares with a small indent. Fits all.

Source Petr Šulc.

Background pattern [email protected] #525
 Noise  CC 0

A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.

Source Firkin

Stone Wall & Dark #1521
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Soft Pad #613
 Fabric  CC BY-SA 3.0

Bumps, highlight and shadows – all good things.

Source Badhon Ebrahim

Dark Sharp Edges #1320
 Dark  CC BY-SA 3.0

Some dark 45 degree angles creating a nice pattern. Huge.

Source Dark Sharp Edges

Psychedelic #745
 Gray  CC BY-SA 3.0

Geometric triangles seem to be quite hot these days.

Source Pixeden

Green Cup #1211
 Unknow  CC BY-SA 3.0

I scanned a paper coffee cup. You know, in case you need it.

Source Atle Mo

Background pattern 302 (colour 2) #1893
 Dark  CC 0

The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.

Source Firkin

Indian Red Web Background #1172
 Concrete  CC BY-SA 3.0

A free web background image with a seamless concrete-like texture and an Indian-red color.

Source V. Hartikainen

Green Subtle Web Texture #1334
 Green  CC BY-SA 3.0

A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).

Source V. Hartikainen

Old Cardboard, Background Texture #1213
 Cardboard  CC BY-SA 3.0

A seamless background texture of old cardboard.

Source V. Hartikainen

Decorative divider 188 #2521
 Dark  CC 0

From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.

Source Firkin

Background pattern yellow #2025
 Yellow  CC 0

Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Prismatic Basic Pattern 2 No [email protected] #448
 Noise  CC 0

Prismatic Basic Pattern 2 No Background

Source GDJ

Floral design 94 #1792
 Yellow  CC 0

From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.

Source Firkin

Retro Circles Background [email protected] #421
 Dark  CC 0

Retro Circles Background 4

Source GDJ