I've got 3 basic passwords. One 'high security' (banks, etc.), the other two relatively low
I use the low often suffixed by a number, at work for instance, where the password has to be changed every month - but all the data is on shred drives so anyone there can access it anyway.
(The best passwords I've ever seen where used by a mate of mine, of Polish extraction. He had a load of the things, all collections of random consonants. I asked him where he got them from and he said they were all names of his cousins).