Yes this is a good idea, I did a post a little bit ago on a password security lesson. There are tons of ways to be secure with your passwords.
My personal favorite is use a sentence that makes sense to you that no one else would possibly guess
For example: MyFavoriteMovie1sPlaceBeyondThePine$
and you can always write down a hint to yourself like "hint:movie" and immediately you'll remember this. It makes it even more secure when you replace I's with 1's and S's with $, and so on.