The initial idioms of the letter I

itsy	itsy-bitsy
itty-bitty	I've done my do
I've got work to do	I've had a lovely time
I've had enough of this!	I've had it up to here
I've heard so much about you	I've never [felt etc.] in all my days!
I've seen better heads on nickel beers	ivy
ivories	ivory
ivory tower	Ivy League
IYHO