Since I last updated on my Pseudocreobotra wahlbergiis they have grown up, some of which are adult and currently mating. None of this new generation shows the bright pink/purple that several of the parents exhibited in their nymph stages. It goes back to the question we all would like to know for sure... is it humidity levels, color of surroundings, etc. that causes variations in the coloring? I don't know.
Here are some of the new generation of nymphs and adults mating.
Pseudocreobotra wahlbergii nymph (December 2009)
Pseudocreobotra wahlbergii mating pair (December 2009)