For non-ironworks, non-workshops approaches, I think the trick is having a treasure card that supports a one-action strategy, so actually its a two-card based deck, but qualifies for one trick pony as the treasure card doesn't count for it.
Looking at my stats, I've done one trick pony 9 times: 3 games with ironworks, 4 games with workshop.
My other two were: Caravan (with one Talisman):
http://councilroom.com/game?game_id=game-20120306-070441-d2a61815.html...though if you look at how this ends, it ends stupidly, with my opponent buying the last colony then losing because he hasn;t added up.
and: Monument with IGG:
http://councilroom.com/game?game_id=game-20120305-105509-297dbbda.html...a tempting board, with all those engine components for goons meganess, labs, king courts, tactician, bazaar... but I took one look at it and thought
"no trashing except lookout, IGG present and monument there? Its gotta be monument/IGG all the way."Perhaps I was lucky that the monuments never collided, but regardless, I felt confident that IGG was going to slow down my opponent enough. In all honesty, what I expected was IGGs bought by my opponent too, and a much faster game, and I never expected to get so many monuments, but there it is...