Design en App-mockup

I Need someone to design an application-mockup for IPhone and potentially later for Android. The application is going to be fairly simple. Some of the key features are: - Logging in to the application with your Facebook profile. - On the main screen you will have the option to select "Yes" or "No" - After selecting Yes you will get a list of all your Facebook friends who have selected Yes in your area. - The application must be able to use the GPS function on the phone to automatically understand which town and country the user is in. - The opportunity to star or block Facebook friends, starred ones send you a notification when they press Yes, while blocked ones don't see you on their list when you have selected yes. - When a user has selected Yes one day it resets to No the next morning at 06:00 AM - An invite/share function to invite friends on Facebook - A settings option where the user can edit settings like notifications etc. - Potentially a message system to chat with other people online Attached is a very simple mockup of the basic concept. What I need from you is an innovative creative design for the whole application. It has to be very clean and and easy to use and understand (I want to avoid the standard IOS UI, take a look at [login to view URL] for something more similar to what I am after). The name logo and theme is not yet decided so I am first going to be browsing through designer portfolios looking for someone with the skills and style I am after.