Prismatic Abstract Background Design
Source GDJ
Prismatic Hypnotic Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
A black tile-able background with paper-like texture.
Source V. Hartikainen
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin