Designing Passwords and Remembering Them Years to come by Sherif Monem

Many passwords require a minimum of 6 letters, some eight? 
So choose three letters you like. may be three letters in the keyboard adjacent or in some sequence, what not?
May be musical sounding.
Repeat them, then now you have six letters, 
Many passwords require numbers, then this is the crux of the matter. You have to have your own scheme based on the name of the account or the web site to devise a set of numbers. You may select the first letter of the web sit to generate three numbers. They may be as simple as 1,2,3 ... 2,3,4, ... 6,7,8 or more sophisticated jumping numbers such as 1, 3, 5 or say 2, 4, 6.

be consistent with creating passwords for all your accounts and you will remember them ten years from now or for ever and not get confused. 

If you have very sensitive account. You must have very much complicated scheme than that to generate passwords based on the name of the web site.

Occasionally, the web site may change the rules of the password time ahead and will not accept your password. So you have to request re-establishing new password.

For special symbols you can choose 2, 3, 4 which will correspond on the keyboard to at sign for 1 as an example or dollar sign for 4.

You can use the special symbols based on the name of the web site.

So as a rule use the name of the website as the seed of creating passwords and you will not forget as you remember your scheme that you keep always with no change.
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other  web sites suggestions

Creating passwords that are both safe and memorable get harder and harder as we have to memorize more and more. Combining words, phrases, numbers, and coding them with simple substitutions will ensure that your personal information is safe. One of the most common mistakes in creating a secure password is replacing letters with numbers. While this may stop most people, almost all codebreaking software these days checks these simple switches first. It is important to be able to come up with passwords that are personal enough to remember but varied and complex enough to be secure, so learning how to create appropriate passwords is a crucial skill that you will undoubtedly use often.

http://www.wikihow.com/Create-a-Password-You-Can-Remember
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http://lifehacker.com/four-methods-to-create-a-secure-password-youll-actually-1601854240