My ritual is very similar to MissJo's. After getting the cards out, going through them to turn them right side up (I only put them in order if I'm very bored,) my opener, borrowed from some Wiccan spell, goes:
"Oracle of lunar light, grant me now second sight"
Then I riffle-shuffle the deck, and fan the cards out on the surface (table, bed, what have you) in a rainbow shape, face down.
I imagine a light rippling over the cards, like an aurora, and then let go of the control in imagining it. I look for "spikes" in the aurora in response to my (questioning) state of mind, and then I draw the card that's beneath the highest spike. Sometimes I urge the light to sharpen and point down at the right card. Whether I set the chosen cards down face up, or face down until the spread is completely laid out, depends on my mood. Even the color of the imagined aurora, I used to be very comfortable with gold, but now I like to imagine that it's purple.
My closing, no matter what time of the day it really is, goes:
"Eye of day, the rising sun, return my sight, night's spell is done."
-- That one, I made up myself.
My cards had been dedicated to the gates of the Akashic Records, or whatever's closest to it in my mind, so while I appreciate when it shows some energy or personality, it's as if it knows what its purpose is, and doesn't require thanks.