what would work , and shows more promise than anything right now , is the crytek engine.
Crysis is a good example of a quality production using the crytek engine.
Its by far the biggest set of leggos out there. 
And its all about the leggo collections.

"The victorious win the battle, then go out to fight ... while the defeated go out to fight, then try to win the battle.   -SunTzu
"The only difference between a capitalist and a communist is that the communist hates competition!" -Circuit