Most of the websites have inbuilt rules for passwords. They throw up alerts if the password we key-in does not comply to their policy.
Here is a sample of password and the subsequent alert:
welcome - Poor
Welcome - Average
Welc@me - Strong
We!c@3e - Very Strong
To take out the boredom
out of it, the alerts thrown up can be made interesting, something like this:
welcome - Are you kiddin'
Welcome - Hacker's paradise
Welc@me - Is that the best you can get
We!c@3e - Are you sure you can remember this later
(sorry if I am not being too creative in above attempt, but am sure you got the concept)