Green Background With Leaves #1331
 Green  CC BY-SA 3.0

It looks very nice I think.

Source V. Hartikainen

 More Textures
Seamless Green Curtain Background #1333
 Green  CC BY-SA 3.0

A free seamless background image with abstract texture of green "curtain".

Source V. Hartikainen

Bark 1 Roughness #1469
 Paper  CC 0

Bark style CC0 texture.

Source StruffelProductions

Part of Bayeux Tapestry 4 #2446
 Noise  CC 0

From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.

Source Firkin

Paper [email protected] #22
 Paper  CC BY-SA 3.0

New paper pattern with a slightly organic feel to it, using some thin threads.

Source Atle Mo

Floors & Dark #1595
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Cork Panel Background Texture #869
 Wood  CC BY-SA 3.0

This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.

Source V. Hartikainen

Nasty Fabric #1008
 Gray  CC BY-SA 3.0

Nasty or not, it’s a nice pattern that tiles. Like they all do.

Source Badhon Ebrahim

Stone Wall & Dark #1547
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

[email protected] #76
 Light  CC BY-SA 3.0

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

Source Ian Soper

Prismatic Abstract Geometric Background 2 No Black #445
 Noise  CC 0

Prismatic Abstract Geometric Background 2 No Black

Source GDJ

Rocky Wall #41
 Wall  CC BY-SA 3.0

High detail stone wall with minor cracks and specks.

Source Projecteightyfive

Dungeons & Flagons 8 #1424
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Retro Squares Background 2 #416
 Noise  CC 0

Retro Squares Background 2

Source GDJ

Stone Wall & Green #1581
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Stone Granite #1292
 Stone  CC 0

ZeroCC tileabel stone granite texture, edited from pixabay. CC0

Source Sojan Janso

Fabric of Squares #1095
 Light  CC BY-SA 3.0

As far as fabric patterns goes, this is quite crisp.

Source Heliodor Jalba

Background pattern 225 (colour 2) #2326
 Yellow  CC 0

Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Dark Wall #817
 Dark  CC BY-SA 3.0

Just to prove my point, here is a slightly modified dark version.

Source Atle Mo

Dark Matter #601
 Dark  CC BY-SA 3.0

The name is totally random, but hey, it sounds good.

Source Atle Mo

Prismatic Abstract Geometric Background 3 #270
 Noise  CC BY-SA 3.0

Prismatic Abstract Geometric Background 3

Source GDJ

Shattered #951
 Gray  CC BY-SA 3.0

A large pattern with funky shapes and form. An original. Sort of origami-ish.

Source Luuk van Baars

Background pattern 225 (colour 5) #2323
 Blue  CC 0

Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Noisy Grid #959
 Gray  CC BY-SA 3.0

This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.

Source Vectorpile

Floral tile 4 #1710
 Dark  CC 0

Derived from an image that was uploaded to Pixabay by darkmoon1968

Source Firkin

Shine Caro #713
 Grid  CC BY-SA 3.0

It’s like Shine Dotted’s sister, only rotated 45 degrees.

Source mediumidee

Prismatic Curved Diamond Pattern 7 No [email protected] #548
 Noise  CC 0

Prismatic Curved Diamond Pattern 7 No Background

Source GDJ

Crossword #1301
 Light  CC BY-SA 3.0

Borderline too subtle. Yes, I said it.

Source Ideawebme

Prismatic Hypnotic Pattern 2 No Background #573
 Noise  CC 0

Prismatic Hypnotic Pattern 2 No Background

Source GDJ