Pick a long word or phrase. I'm using my name "OWEN" for the example.
For each letter in the phrase, hold down alt and trace the shape of the letter out on the keyboard.
O is a circle, so it's Alt plus 79317 or
W is 71539 so s
E is 97513 so
N is 1739 so
You can change the shape you draw for each letter too, so E could be 9745413 or , N could be 178239 or ?.
Of course, this only works if the system supports full unicode.