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Your password should contain two parts. First part should be identical for all your passwords and should only kept in your memory. Use any long, easy to remember name, like your name, your street name, name from your family. Add one special symbol. For example: John[, or JohnSmith#, etc.
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For each new password add few very random symbols, in different registers, selected from letters a-z, digits, 0-9 or special symbols, like [{(-=# etc. For example, fT]34 or []$k3, etc. This part of the passwords you should keep in writing.
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Now it is very easy to make your password – take your secret word from step 1 and add random sequence from step 2. This will give you reasonably secure, and easy to use password.