1 and 2 are looking at a forest environment, which is where slime mold would usually be found. The grey tones for the forest aren't definate but they do help to highlight the slime mold, even when it is zoomed out.
3 would incorporate an extreme hill environment, which could be quite effective graphically and more in line with the style I am beginning to work towards. This type of environment would work especially well for showing distant slime molds as well as the foreground focal point. This is one of the things Phil suggested and it could be animated in flash. Distant slime molds would show the process as well.