I was looking long and hard for the same thing before i started playing for real, while i was still studying the game. The best thing i found was to play fake money on pokerstars
(or any poker client of your choice).
As with any fake money game, you're gonna have people shoving 72o preflop. but there are also some players who take it more seriously. I believe you'll find that even YOU cant hold back from calling that all in with a marginal hand. i know i did.
but i imagine if you were to try to buddy up those guys who are playing it ore seriously, and play private games with them, it could be beneficial. however you do miss out on the most beneficial aspect of online poker, that is reviewing and analyzing your own hands.