Startup Idea : Customized Greeting Cards Delivered

About a decade ago, people used to go to a store and handpick a card, write their message and send. Now people just go online, choose a flash animation and send it. No real emotions are put into it. Its just a formality now. So my idea is to make a web app which lets you handpick cards from a virtual store (a complete card shop interface) and then lets you customize it, (write stuff anywhere, draw on it, put pictures maybe) and then We deliver it 'by post' to your loved one. Payments will be online of course at the time of sending. To reduce the price of sending a card, I plan to collaborate with some advertisement agencies, so along with your card, you get a small sheet with some ads. In return, these agencies give money which will help in posting the cards.