It sounds to me that you did what I originally did as well, I made an 12X12 and the AKA template is a 5X7 ratio. I redid mine in the other format to match others but you might be interested in doing something like Kayleigh did.. I thought it was ingenious!
If you do the 5 X7 format, I saved mine as 72 dpi/resolution and 500 pixels by 700 pixels.