The project i want to do, is an online album (not photography), I really don't know what the word in english is, but it consist in the following:
The users registers and choose one or more album to complete (Maybe this will give you and idea of what i mean when i write album), the album can be of anything, cars, music, tv shows, etc.
Each day the system automaticly send 5 "stickers" or "images" randomly to the user, in order to complete the album. If the user wants, he/she can buy more stickers thru paypal or some similar service (maybe SMS?).
Please check the attached file, it's a raw example of what we need.