At first, I used complex alphanumeric passwords.
Then some system asked me for some Case. So I added up some actual Easily Guessable Case.
Then some system asked me for some Sp#ci@l characters. So I added them (@g@!n e@sy to f!nd).
Then some system decided it didn't like Sp#ci@l characters. So I only added them when needed only
Then I tried migrating to Pass Phrases. However, the Sp#ci@l still needs to be there sometimes, and sometimes they don't like that, and sometimes, spaces aren't supported, and sometimes, there's a limit of 15 characters.
Then, I found one site that actually asked me for PRECISELY 8 characters, with mixed, number and special. The frag!
And I have two places where I need to switch passwords every now and then (3 months and 6 months)
So I freaking gave up. At home, my crap is seriously secure. It's long pass sentences with some mistakes in them, it's easy to remember them, and hard to figure them out. Whenever I can, I use these pass sentences, always different, because my brain actually remembers these passwords, and they are kind of related to the system in question, for example, on a Fruity system, I might write "I SIRIously love cider"
Everywhere else, the "dick" sites and systems, I have 3-4 passwords, precisely 8 characters in length, with option@1 specials and one ever incrementing character somewhere... Because I need to remember these.
Oh and then, for crappy sites I couldn't care less about, I'm in the top 50 easiest passwords to find. Find them, I couldn't care less.