This one doesn't quite fit the "Adam and Eve in the Garden" narrative, but I look around (and inside myself) and I see the truth in it.
28 And just as they did not see fit to acknowledge God any longer, God gave them over to an unfit mind, to do those things which are not proper, 29 being filled with all unrighteousness, wickedness, greed, evil; full of envy, murder, strife, deceit, malice; they are gossips, 30 slanderers, haters of God, insolent, arrogant, boastful, inventors of evil, disobedient to parents, 31 without understanding, untrustworthy, unloving, unmerciful. 32. ... they not only do the same, but also give hearty approval to those who practice them. (Romans 1:28-32b)
Ahh, the "unfit mind". The gift that keeps on giving.
These are the verses I would use to support the concept of "Original Sin". Even though we are capable (and even THAT'S debatable) of works of great love and altruism and self-sacrifice, we are inherently self-centered. And I notice that the self-centeredness doesn't completely go away when we come to Christ.