Display facebook profile pictures full size on call

Question

I synced my friends' Facebook profile pictures with the facebook iPhone app. When I get a call from someone it has the picture displayed in small in the top right corner.

When someone calls whose contact photo I've taken with the iPhone itself, however, it looks like this:

— the picture is "full screen".

Is there a way to (automatically) get the Facebook profile pictures displayed this way? My iPhone is a 3G jailbroken on 4.2.1, so a Cydia tweak would be absolutely fine.