You can spend a lot of money upgrading your house(s) in Skyrim, which will eventually include things like food, potions and ingredients spawning in the house (one-off or respawning, I'm still not sure, but that's a different question!).
Are there any unique items that are only obtainable from upgrading a house (either fully or partially)? I think I read something about a Stone of Berenziah spawning in an upgraded house but I can't find a source for that. Perhaps some weapon or armour gets added to a display stand?