If you did press ups every day, you'd progressively get better at press ups. This would increase your muscular endurance, and to a lesser level your strength.
Press ups alone won't get you huge, but they will make you more defined in certain areas over time.
It's hard to give an simple, definitive answer though. For example - someone who is gifted/lucky genetically, has spot on nutrition and does 100 press ups a day three or four times a week is going to notice more gains, quicker than someone who is not so lucky with their genetics and eats poorly.
Personally, a variety of press ups are a staple of my training programme. My coach and I find this works for me and the fitness goals I have relating to my sport. IHMO press ups are a fantastic exercise, but if you're looking to get 'built', I'd join a gym and create a structured training programme involving free weights etc.