Like I've said before, a password is only as secure as the server it's stored on.
If somebody gets in, it doesn't matter if your password is [email protected]$t or mickey mouse.
This is rule number one for me. It used to be that we were supposed to make passwords "easy to remember but hard to guess". Yeah, make it so that your family or your boss or your pals won't guess it (if that's who you want privacy from), but beyond that, the complexity, bits of randomness or key length don't matter much anymore. Once a server gets hacked into, there's no telling what happens next.
For the really important stuff (where I could lose money or critical access, like banking or my domain control panel) I use long, complex passwords; other than that I don't even bother any more.
What happens in the end that someone hacks into your ISP
and they can't even tell exactly what was accessed. Or one day you find unauthorized charges to your credit card, because you paid with this card online once and some idiot thought it was a good idea to store your cc number on their badly secured server "for your convenience". (I was lucky and got every penny refunded by VISA within a week; the charges were obviously fraudulent, like $20 every hour from some UK gambling joint until the account was empty.)
But, FWIW, to me the most useful method for generating a fairly secure (in the outdated sense) password is to start with a quote or a line from a book or a song that you know well and take the first (second, third, take your pick) letter of each. Make some of them numbers or add punctuation if you want, but the important thing is to use a fairly long quite, and not something obvious like "to be or not to be".
Another way that I've used a few times: just type nonsense on the keyboard but in such a way as to let your fingers do the work for you. Type keys that feel natural to press one after another, so that the typing itself has a "flow". For example, if you use only the left hand, typing "wjzu" on a QWERTY keyboard is hard and slow, but typing "wdax" is quick and feels natural. Extend this to 10 or 12 characters and learn this flow, then your muscle memory will do the rest. I sometimes forget my PIN, but I remember the pattern of buttons to push, that's just as good.