Personally, I think utilitarian is the way to go. Anything beyond that is usually more for us than for them. This is especially the case with ball pythons, who have simplistic requirements. Perhaps arboreal species may benefit from a lot of decoration in their enclosures, but that is in line with their necessities (i.e. climbing) and just happen to be visually stimulating. Especially if you plan to keep a large collection relative to the amount of time you have available, it would make more sense to keep your herps in well-maintained simple enclosures than seldom cleaned fancy ones.