Another tip on dreaming up passwords is to use, eg, a memorable poem or quote to help you remember. So, to use a random example, take the first letters of the words in:
Now is the winter of our discontent made glorious summer by this son of York
That becomes :
nitwoodmgsbtsoy
Switch in some capital letters and top-row characters and you get
n!Tw0OdmG$bT5oY