Application UI design

We are looking for someone to redesign the UI of one of our products. I attached a screenshot of this application. You can check out a demo video of this application here: [login to view URL] This application is skinnable. This means we can create a custom look for each of our clients. So for each client we change the colors a bit, and add a new header graphic. But now we are looking for a better "standard design". We want something fresh/modern, more up to date then our current design This is a Flex application. So when making a new design, it is important to keep all elements the same size. Otherwise we'll have too much work refactoring the application. We just want to be able to replace the graphics. Other then that you are free to do as you wish. Please show examples of your design work. Bids without samples WILL be ignored!