Ways to create and remember difficult password generated from you very common password

keep only one simple password but change the mechanism to convert it into different code
1. Generate a new password by typing your password on mobile key pad and  
    enter that mobile number as password for you log-Ins.
2. use Google translator to convert your simple password to another language
    and use that as the Password. you can Change as switch to as many
    languages as you want .
3. use unicode converter online, to get new symbols for your simple password.
4. Use l33t converter (hackers Language) to get new password.
5. .......