Well its been a while since thieves have gotten much after the big nerf aside from the items in the dungeons that you have to steal off the ground so I have an idea that sounded fun in my head. Some new area's need to be created, like a dungeon except instead of monsters there would be either red npc's or just npc's that attack and have high end paragon speed. To gain access to these dungeons you would have to get a quest from the thief guildmaster to do a heist of the dungeon/fort/cave whatever and to get to the end you would either need to follow clues be very strong or very stealthy the end monster or npc that you steal the item from should be near un-killable so that it would make it very difficult for any other type of player to do these quests. And after the item is stolen the end baddie should chase you out of the area and if you manage to escape you have a nice new shiny.... This would be a fun new way to intoduce some new stealables and give some exitement back to thieving, instead of the "recall in, ooo some books laying on the ground, steal, recall out" routine.