I don't know if someone else has brought this up before, but I would really love the addition of a homestead house or two that is earned via stealing/Thieves guild. Some kind of shady, den that's hidden away. Or possibly to work with the Assassin's guild to kill and take over someone's home.
What would be even more fantastic is having the chance for a stolen item to be a rare, uncommon or common version that can be actually used in your home. So many of the stolen items in game are interesting and it'd be cool to fill a den full of these spoils and curios.
Ashanu Iru'Anai | Dunmer Templar (EP) Nomadic Ashlander
Valanara Adal'anir | Altmer Sorcerer (AD) Master Crafter
Valar'ya Viszcari | Dunmer Dragon Knight (EP) Kick-Ass Adventurer and Blacksmith
Sylvari Iru'Anai | Bosmer Knightblade (EP) Werewolf, Thief, Rebel, and Outcast
Chretien de Troye | Breton Templar (DC) Chef de Cuisine, Bard, and Healer
Ras'Tafari | Khajiit Knightblade (AD) Laid-back Mis-Adventurer, Cool-Cat, and Part-Time Thief
Wind-In-The-Willows | Argonian Templar (AD) Has lost Hist Way
Viszcenti de Vedici | Dunmer Sorcerer (EP) Vampire with a taste for the finer things in life
Vilaryu V'driszyu | Dunmer Nightblade (AD)
Amaltheia Althaia | Altmer Templar (AD)
Sabah Al'khir | Redguard Warden (DC)