A seamlessly tileable pink background texture.
Source V. Hartikainen
Embossed lines and squares with subtle highlights.
Source Alex Parker
Similar to original, but without gaps in between the arrows. This seamless pattern was created from a rectangular tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
From an image on opengameart.org shared by rubberduck.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim