Prosperity - Cornucopia card set
There are no "official" kingdom sets for Prosperity and Cornucopia. Personally, I like it when both Tournament (from Cornucopia) and Colonies (from Prosperity) are out, because it tempts people to try to buy some Provinces and end the game on piles. Even more interesting if Bishop is out, so you could potentially trash the Provinces for decent points.

I'd recommend just playing random sets until you find interactions you like. For generating random sets, I like http://www.hiwiller.com/dominion/, but there's lots of other tools out there.