Since all I personally know about post processing is the abilities Picasa affords me, except for using the clone stamp in photo shop, I think I can't properly answer this one.
I do not remember how the question was resolved when recently we re-evaluated some of our parameters for the contests. I determined then that my limited post processing falls within the acceptable realm, and let it go.
About the orchids: It did not occur to me to look at them as digitally enhanced. I see the first one as an overexposure that was taken through the paces of some sliders, and the second one was normal to me. I'm not sure that the photographer considered them as a potential entry, I played with them and took it into the realm of positive/negative with my response and the crops.
I am proving that I can't answer this without help.
The help could come from someone who finds the poll results we ended up with when this issue was discussed maybe 6-8 months ago, or from someone who jumps in and opens this for a more public discussion or explanation.
As the hostess, if I am the one to be left with the decision here and now, I say I'm interested in a photo where the negative space plays a role that is if not predominant at least playing a large part and is interesting. Where the balance of positive and negative is considered, and where shapes are recognizable as a photograph.
I think with this theme we do venture out a bit into the area of spacial "art" more than usual, and I have no problem with this at all.
Please tell me this helps.
I'M EDITING this to add a visual:
I took the photo in my hallway yesterday afternoon, in the evening sun, and I like it just like it came out in the camera

Now I took it into Picasa, and with the tools available there I turned it into photo number two, which to me would be perfectly acceptable as an entry, and which would not get up my caution flags as over processed or overly enhanced. I would look at it as an interesting photo dividing up space in a pleasing way.

Let me know what you think, if you so chose.