Pregenerated Files
Before I get the question of "what's the normal ratio for house bricks?", let me just say - there is no answer. Whatever you think is normal may not be normal. It is probably regional and time-dependant. That being said, I personally enjoy 1:1 ratios in interiors and 5:2 in exteriors. Remember to leave room for mortar if you will be using mortar.
Wait! I think it is possible to make a stackable brick that has one face with a 5:2 ratio and the opposite face with a 1:1 ratio! This would be the most pleasing of all possible bricks. Someone got a 3d printer for a quick mockup?
