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I bear a charmed life
I have not slept one wink
I have nothing to declare but my genius
I have nothing to offer but blood toil tears and sweat
I haven't got a clue
I see you stand like greyhounds in the slips
I spy with my little eye
I will wear my heart upon my sleeve
Identity theft
If I had my druthers
If music be the food of love, play on
If you can't stand the heat, get out of the kitchen
If you think that, you have another think coming 
Ill wind
I'll be there with bells on
I'll go to the foot of our stairs
I'm stumped
In a pickle
In a quandary
In a trice
In an interesting condition
In like Flynn
In limbo
In my mind's eye
In someone's bad books
In stitches
In the bag
In the box-seat
In the buff
In the cart
In the catbird seat
In the club
In the doldrums
In the limelight
In the offing
In the pink
In the red
In the twinkling of an eye
In trouble
In your face
Indian giver
Indian summer
Iron hoof
Is the Pope Catholic?
Is the Pope Polish?
Is this a dagger which I see before me?
It came like a bolt from the blue
It is meat and drink to me
It never rains but it pours
It's all grist to the mill
It's better to give than to receive
It's better to light a candle than curse the darkness
It's that man again
Ivory tower