Background pattern 252 (colour 4) #2159
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Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

 More Textures
Abstract Geometric Monochrome Pattern Prismatic No Background #385
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Abstract Geometric Monochrome Pattern Prismatic No Background

Source GDJ

Background pattern 256 #2139
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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

Prismatic 3D Isometric Tessellation Pattern 6 #148
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Prismatic 3D Isometric Tessellation Pattern 6

Source GDJ

Random Binary Background #274
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Random Binary Background

Source GDJ

WaveCut #75
 Light  CC BY-SA 3.0

If you like it a bit trippy, this wave pattern might be for you.

Source Ian Soper

Tessellation 15 #2223
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The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.

Source Firkin

Electric recharge #163
 Noise  CC 0

Simple turbulence filter rigged in in inkscape.

Source Lazur URH

Bright Multicolored Floral Background #559
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Bright Multicolored Floral Background by Karen Arnold from PDP.

Source GDJ

Fancy Deboss@2X #178
 Fabric  CC BY-SA 3.0

Luxury pattern, looking like it came right out of Paris.

Source Daniel Beaton

MBossed@2X #194
 Grid  CC BY-SA 3.0

Embossed lines and squares with subtle highlights.

Source Alex Parker