not easy ones. I suppose you could make a pic of the sky in Bryce, save as a jpg (about 800x800, or to taste), then UVMap the texture to an object (flat plane, for example). then import the whole thing into Poser, and try lighting it? kludgy, but possible...

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)