A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Colour version of the original pattern.
Source Firkin
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso