In order to reveal new gifts, you need to send friends gifts, and since I was very intrigued to see the available gifts... I find myself using that application allot...
In the top of the application I noticed an option to create your own gift. clicking on the link, I got a wizard application called Gift Creator. This is a wizard for creating an application without needing to have the knowledge of a developer, or in my case PHP. (although I know many things, I didn't get the chance of working with PHP...yet...)
So to make things short, what you need to do is this:
1- Install the make gift application
2- Follow the instructions
3- That's it!
The instructions are very simple and well explained. I whish all program installations would be clear as the instructions in this wizard (including the .Net Web Services Wizard...).
In the process of creating your gift application you first uploads the images - a.k.a the gifts, then you install the Facebook Developer and you are left with 3 simple and clear stages, that the Gift Creator guides you through:.
1- Create a new application in Facebook
2- Update the Gift maker application with the Facebook Keys
3- Update the resulting application URL in the Facebook application
Have Fun!, and no, Im not telling what is my gift application :)