How do we bless God?

An old praise and worship song popped into my head the other day. "Bless God, for all He's done, bless God for Christ His Son..." I can't find it on the internet or I would post it, but it got me to thinking, how do we bless God? Any thoughts on this? I hope to be able to study this and post my findings, but I just wanted to throw that out there for any of you who read this.