Basic song to the Popcorn Popping tune:
I looked out the window and what did I see...?
I saw the letter looking at me.
(Substitute for whichever letter you are singing about and then add the following to describe)
Letter A
Go up middle mountain and come back down.
Then take little trip across the town.
Letter E
Go left across the top and then go down.
Travel to the right, then cross the town.
Letter I
Go down the middle, like the number one.
Add a roof and a floor and then you're done.
Letter O
Start at the right top corner; go left, then down.
Then head right until you're all around.
Letter U
Draw a wall down the left and then a floor.
Draw up another wall. And then no more.