Concentrate on the main functionalities first. This is something we learnt in the past projects we did. No need to discuss the color combinations at this stage. How does that relate with this project? Well, for example it would be nice to offer the service also to Picasa users. But all "would be nice" features that take more than a couple of hours to fix, are suspended by definition in our startup projects. We keep it simple. That's better for us, but also more clear for the potential users. No hassle with different kind of signups. So, what do we concentrate on right now?