sounds like a deep question now doesn't it?
well if you follow the 3XL blog then you will know he has moved into an apartment and is doing a very admirable job of coating almost everything in black latex. check out his progress in this old entry with photo's here.
if you have a budget then you can splurge on proper designer rubber furniture from dutch company Wessemius who do everything from mirrors, stools, light stand and beds out of what appears to be industrial inner tubes. look around the site as there seems to be a couple of versions of it with different galleries available.
my favourite is the couch, though they do have a shower set up that could make a good gothic doll box. their other stuff would go well in a Tim Burton film however...