Hi, Rork1973...

The basic idea is this: every entrant may enter to the contest with a portfolio made up of a defined number (or, maybe less and equal to a defined number) of photos, where every photo deals with that months particular theme.
Thus, for example, one entrant may choose one simple shape and work with it using different angles, different lighting, etc., and another entrant may choose, say, 3 different simple shapes and work with them in ways of his/her own photographic choice.
So, every entrant produces a work in series that is made up of "less and equal to a defined number" of photos.
Such a work would probably be more definitive of that person's approach to the theme, usage of technique(s) chosen by him/her...
For example, when looking at PunkClown's work, after finishing to evaluate that image, I immediately start to ask for......variations...
And, this also applies to Maygen's, Alpha's or other entrants' works.
I hope I was able to tell what I mean... :)

Well, this took so long, and given the fact that I have time, let me reply to brittmccary and PunkClown seperately