I don't know if this is a good idea or not, but it's something I thought of that might be a bit easier than the birthstone idea, but would still have a theme (sort of) to please the higher ups.

The Eden Fantasys Calendar: Au Naturel

And the theme would be photographs of things that occur in nature, untouched by mankind.

The title would be fun, because although it literally means "in a natural state", it has come to mean nude, and since EF is a sex toy site, well... Also, the name "Eden" is associated with a "natural" paradise, so it would work in that sense as well.

In looking through the pictures that people have already taken and posted on EF, there are many shots of natural subjects, wildflowers, insects, wild animals, forests, waterfalls, streams, snow covered hills, rainbows, etc... So we know that that the Eden photographers have access to natural subjects to photograph and may already have pictures that can be used. Even those who live in big cities could probably find a park or vacant lot where there is something natural to photograph: the sunlight through leaves or even just the clouds in the sky.

Anyway, it's just an idea that popped into my head, and I thought that I would share it.