If you have many accounts then you need to generate a different password for each account. Besides, you need to keep changing them every now and then. This can get really difficult as you might run out of ideas and reach a dead end and wonder what password to set for each account. Here's a simple idea on Excel which generates two random capital letters followed by two random numbers and again two random capital letters and two random numbers.
In column A, cell 1, type the formula =CHAR(RANDBETWEEN(65,90))
Copy this to cell B1
In cell C1, type the formula =RANDBETWEEN(1,9) and copy it to cell D1
Repeat the process for the EFGH cells and you're on!
After you're through with this then press F9 and you'll get a new set of characters and numbers like this: