If you look at those websites you'll find that they're very similar to each other, that's probably because everybody is using templates for the front-end part of their site, such as bootstrap templates or custom responsive templates. Since the important things happen in the back-end, nobody is willing to spend their time (and money) asking their developers to customize their front-end too much. Regarding your startup, I personally think it's too late to start a new blockchain project right now since there are thousands of them, but I'm sure that you will find developers willing to work on it if you search for them (you can hire them directly on any job searching website). Good luck!
RE: How Do all new cryptocoin companies have such a beautiful websites?