Seamless tile 4 #1812
 Red  CC 0

Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern

Source Firkin

 More Textures
Yellow Wood Planks Background #876
 Wood  CC BY-SA 3.0

This background pattern contains a texture of yellow wood planks. I think it looks quite original.

Source V. Hartikainen

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

Prismatic Abstract Geometric Background 3

Source GDJ

Stitched Wool #843
 Light  CC BY-SA 3.0

I love these crisp, tiny, super subtle patterns.

Source Badhon Ebrahim

Colorful Floral Background 3 No [email protected] #486
 Light  CC 0

Colorful Floral Background 3 No Black

Source GDJ

Floral design 99 #1776
 Dark  CC 0

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

Source Firkin

Iron Rusted & Dark Red #1659
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Leafy pattern 9 #1802
 Green  CC 0

Remixed from an image that was uploaded to Pixabay by KirstenStar

Source Firkin

Pineapple [email protected] #584
 Diamond  CC BY-SA 3.0

I love the movie Pineapple Express, and I’m also liking this Pineapple right here.

Source Audee Mirza

Background pattern pink #1948
 Pink  CC 0

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

Source Firkin

Prismatic Chevrons Pattern 5 With Background #469
 Dark  CC 0

Prismatic Chevrons Pattern 5 With Background

Source GDJ

Subtle White [email protected] #1104
 Light  CC BY-SA 3.0

This one is amazing, truly original. Go use it!

Source Viahorizon

Wood 3 #1445
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Pewter & Gray #1637
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Prismatic Hexagonalist Pattern No Background #390
 Light  CC 0

Prismatic Hexagonalist Pattern No Background

Source GDJ

Prismatic Curved Diamond Pattern 6 No Background #545
 Dark  CC 0

Prismatic Curved Diamond Pattern 6 No Background

Source GDJ

fawn spot pattern #2472
 Dark  CC 0

The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.

Source Yamachem

Background pattern 259 (colour 5) #2098
 Pink  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

Argyle #643
 Dark  CC BY-SA 3.0

Classy golf-pants pattern, or crossed stripes if you will.

Source Will Monson

Photography #1304
 Unknow  CC BY-SA 3.0

Neat little photography icon pattern.

Source Hossam Elbialy

[email protected] #778
 Light  CC BY-SA 3.0

Cubes as far as your eyes can see. You know, because they tile.

Source Jan Meeus

Farmer #659
 Fabric  CC BY-SA 3.0

Farmer could be some sort of fabric pattern, with a hint of green.

Source Fabian Schultz

[email protected] #716
 Light  CC BY-SA 3.0

One more in the line of patterns inspired by Japanese/Asian styles. Smooth.

Source Kim Ruddock

Fruit on a branch #1969
 Dark  CC 0

From a drawing in 'Line and form', Walter Crane, 1914.

Source Firkin

Prismatic Floral Pattern 3 Variation 3 No Background #386
 Noise  CC 0

Prismatic Floral Pattern 3 Variation 3 No Background

Source GDJ

Background pattern 251 (colour 4) #2164
 Blue  CC 0

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

Source Firkin

Small Crackle Bright #352
 Light  CC BY-SA 3.0

Light gray pattern with an almost wall tile-like appearance.

Source Markus Tinner

Dark Wall #817
 Dark  CC BY-SA 3.0

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

Source Atle Mo

Prismatic Snowflakes Pattern No Background #411
 Light  CC 0

Prismatic Snowflakes Pattern No Background

Source GDJ

Corrosive Dark #1661
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Colorful Floral [email protected] #480
 Noise  CC 0

Colorful Floral Background

Source GDJ