Enlightenment is not a state of altered consciousness, enlightenment is the natural state of all things.
From the position of enlightenment every other state will be a state of altered conscious.
The most altered state of consciousness is the egoic state of consciousness (watching true the ego) .. you perceive things that arent there: enemy, duality, self image.. while there even isnt a self, the thought thinking about this self-image is the closest by a self you can find.
If you really want an altered state of consciousness .. ego is the best you can get ! stick with it !
HAHA, this guy knows what he is talking about

Also thanx for posting the nice picture Trunk, reminds me of this very known poëm from William Blake:
To see a world in a grain of sand,
And a heaven in a wildflower:
Hold infinity in the palm of your hand,
And eternity in an hour.
Regards !