DIY invitations sounds very good. My wife di all of our invitations from scratch. She is very artsy/crafty. They were awesome, but a ton of work.. if she could have started with a bit of a package, then just put it together and play with it, it might have been way easier and saved a ton of time. I think you have a great idea. I hope it goes well for you. Online marketing will definitely work for this. You could sell and ship these packages worldwide.

Michael