We've done aft balconies on Princess. On Carnival there are some odd shaped cabins that have wider but not necessarily deeper balconies. Or example, on Splendor we has 7433 which wrapped around the aft service stairs.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015