If you want to use the "bunny rabbit" method, the easiest way to turn your granny into a bow is just to switch which way you tie the laces over each other at the beginning – that is much easier than trying to invert the bunny ear thingy.
However, the even easier way (and what GC was pointing out) is the "Ian" method, where you pull the bows through each other simultaneously, which (with practice) is faster and always guarantees a bow knot.