Graphy #350
 Grid  CC BY-SA 3.0

Looks like a technical drawing board: small squares forming a nice grid.

Source We Are Pixel8

 More Textures
Embossed [email protected] #732
 Paper  CC BY-SA 3.0

One more from Badhon, sharp horizontal lines making an embossed paper feeling.

Source Badhon Ebrahim

Background pattern 257 #2137
 Dark  CC 0

Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i

Source Firkin

Chequered dotted cat #2430
 Grid  CC 0

A chequered cat with polka dots and background.

Source Firkin

Floral pattern 18 #1716
 Dark  CC 0

A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i

Source Firkin

Floral background 2 #380
 Wall  CC 0

Background formed from the original with an emboss effect

Source GDJ

Skewed Print #819
 Dark  CC BY-SA 3.0

An interesting dark spotted pattern at an angle.

Source Hendrik Lammers

Grunge For Surfaces 5 #1402
 Dark  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Lego background #266
 Noise  CC 0

Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.

Source Firkin

Sixties background #1919
 Colorful  CC 0

Fix side and a seamless starry tile.

Source SliverKnight

Vines #1693
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Hexabump #953
 Dark  CC BY-SA 3.0

Hexagonal dark 3D pattern. What more can you ask for?

Source Norbert Levajsics

Floors #1590
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Retro Circles Background 4 No [email protected] #423
 Dark  CC 0

Retro Circles Background 4 No Black

Source GDJ

Prismatic Dots Background [email protected] #508
 Noise  CC 0

Prismatic Dots Background 4

Source GDJ

SOS #1180
 Light  CC BY-SA 3.0

I have no idea how to describe this one, but it’s light and delicate.

Source JBasoo

Dungeons & Flagons 2 #1418
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Background pattern 9 (greyscale) #213
 Dark  CC BY-SA 3.0

Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net

Source Firkin

Tileable Off-white Background #1191
 Concrete  CC BY-SA 3.0

A free tileable background colored in off-white (antique white) color.

Source V. Hartikainen

seigaiha subtle color #2278
 Pink  CC 0

This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .

Source Yamachem

[email protected] #724
 Fabric  CC BY-SA 3.0

Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.

Source Janos Koos

Worn Out Cardboard #1214
 Cardboard  CC BY-SA 3.0

A seamless texture of worn out "cardboard".

Source V. Hartikainen

Background pattern 234 (colour 2) #2258
 Green  CC 0

Drawn in Paint.net and vectorised in Vector Magic.

Source Firkin

[email protected] #744
 Grid  CC BY-SA 3.0

Sharp but soft triangles in light shades of gray.

Source Pixeden

Background pattern 250 (colour 3) #2169
 Colorful  CC 0

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

Source Firkin

Prismatic Polka Dots 3 No [email protected] #529
 Noise  CC 0

Prismatic Polka Dots 3 No Background

Source GDJ

Abstract Geometric Monochrome Pattern Prismatic No [email protected] #809
 Noise  CC 0

Abstract Geometric Monochrome Pattern Prismatic No Background

Source GDJ

White Well & Fissure #1701
 Wall  CC 0

Background Wall, Art Abstract, white Well & CC0 texture.

Source Ractapopulous

"Gray Stripes", Background Pattern #941
 Stripes  CC BY-SA 3.0

This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.

Source V. Hartikainen