Need a program that can replace the little green android icon when there's an incoming call.

The requirement goes like this
1. Run the program in background and check every 60 sec for 3 jpg files in a certain url. If any of jpg files is updated on the website, download it.
2. There's a list for 3 phone number, and each number is mapping with one jpg.
3. When there's an incoming call, and the number is in the list above, show the corresponding jpg downloaded in point 1.

If you cannot replace the little green android icon, you can cover it with a toast view. Either would be ok.

This is a first step of a big project. So if you can deliver program with good quality, we can have some long term cooperation. We'd like to see nice coding style. And if you have a team of 3-5 elite android engineers, this project is good to show your strength.

We need a quick solution, so if you cannot start working on it immediately after you won the bid, please don't bid.
Please put this word in the bid: a-n-d-r-o-i-d-icon

Send me a demo for this project, or a list of your history project would be good.