Leaded glass background (colour 6) #2047
 Colorful  CC 0

Seamless pattern the tile.

Source Firkin

 More Textures
Prismatic Dots Background #501
 Noise  CC 0

Prismatic Dots Background

Source GDJ

Background pattern 250 (colour 2) #2170
 Blue  CC 0

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

Source Firkin

Notebook #1178
 Gray  CC BY-SA 3.0

This one is super crisp at 2X. Lined paper with some dust and scratches.

Source HQvectors

Cloth & Gray #1622
 Fabric  CC 0

Fabric. CC0 License.

Source Unknow

Bright Multicolored Floral [email protected] #560
 Noise  CC 0

Bright Multicolored Floral Background by Karen Arnold from PDP.

Source GDJ

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

Retro Circles Background 4 No Black

Source GDJ

Fabric pattern (colour 2) #2401
 Fabric  CC 0

Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Spotty Pink Background (Seamless) #1236
 Pink  CC BY-SA 3.0

A free seamless background with pink spots.

Source V. Hartikainen

Background pattern 235 (colour 4) #2252
 Green  CC 0

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

Source Firkin

Corrugation #765
 Light  CC BY-SA 3.0

The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.

Source Anna Litvinuk

Fire diamond #2488
 Diamond  CC 0

U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.

Source Firkin

Transparent Square [email protected] #299
 Grid  CC BY-SA 3.0

The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.

Source Nathan Spady

Starry background 2 #1935
 Dark  CC 0

Inspired by a design seen on Pixabay

Source Firkin

Sativa #1306
 Dark  CC BY-SA 3.0

Honestly, who does not like a little pipe and mustache?

Source Luca Errico

Brushed Aluminum 2 #1390
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Background pattern 251 (colour 3) #2165
 Blue  CC 0

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

Source Firkin

Batthern #324
 Grid  CC BY-SA 3.0

Sometimes simple really is what you need, and this could fit you well.

Source Factorio.us Collective

Light Wall #1265
 Wall  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Pale Olive Green Background, Seamless Texture #902
 Stripes  CC BY-SA 3.0

A pale olive green background with a seamless texture.

Source V. Hartikainen

Congruent Pentagon Outline #1308
 Dark  CC BY-SA 3.0

By popular request, an outline version of the pentagon pattern.

Source Atle Mo

Flowery pattern 3 (BW) #2331
 Dark  CC 0

Adapted from a jpg on Pixabay.

Source Firkin

Triangular #1156
 Gray  CC BY-SA 3.0

Dare I call this a «flat pattern»? Probably not.

Source Dax Kieran

Gray [email protected] #18
 Dark  CC BY-SA 3.0

A dark gray, sandy pattern with small light dots, and some angled strokes.

Source Atle Mo

Tile-able Wall Texture (Light Orange Brown) #1051
 Stone  CC BY-SA 3.0

A seamless texture of an abstract wall colored in shades of light orange brown.

Source V. Hartikainen

"Dark Brick Wall", Background Pattern #1024
 Stone  CC BY-SA 3.0

Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.

Source V. Hartikainen

Background pattern 6 #226
 Noise  CC 0

A pattern derived from part of a fractal rendering in Paint.net.

Source Firkin

Background pattern 289 #1937
 Orange  CC 0

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

Source Firkin

Bird pattern #2293
 Pink  CC 0

Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

Metal Pole Rusty & Glod #1654
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Fabric pattern (colour 5) #2398
 Fabric  CC 0

Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin