Actualy I think it is a matter of practise. I am a fairly ok coder (django and python :D), but I am not exactly artistic. But I attribute that to "oh i am a good coder, so its ok for me to not put in the effort to learn UI and Design skills" mentality. Note that this is not something I do actively. I do try and make an effort to read UI books but the effort is no way even close to what I do trying to tinker with all things coding related. Unfortunately, while there is an element of genius/talent/"born with it", it is ultimately a matter of hard work (a saying about perspiration and inspiration by Edison comes to mind).