A couple that I've tried and enjoyed were Epeiros conquering all of Italy in 25 turns and establishing an Italiote Empire (The new Epeirote government options in 2.35a really help with recruitment and construction), and Sauromatae migrating into Parthia/Baktria in 2.35 (The extremely prevalent sauro_admin government even allows recruitment of Baktrian Medium Cavalry and Parthian Cataphracts).

Another forum member mentioned hording the Boii ASAP and migrating into Galatia for Celtic Invasion 2: Electric Boogaloo. What are you experiences/ideas to share? Migration campaigns can offer a refreshing take on EBII gameplay