1. I made that mistake in undergrad and I think the web site may have done the opposite for the application for me at that point.
2. Admissions may not have the time to look at it, but if they do make sure it is all relevant to your application and nothing that could cause you damage (ex. link to goofy twitter or facebook account, or linkedin page that mismatches your MBA profile)
3. A Stanford admissions officer told me yesterday that they would rather applicants not send anything beyond what is required as a matter of fairness. They said they want to evaluate everyone with the same amount of information that is set as a standard. An also said that breaking the generally set guidelines could be a sign of bad judgement.
4. Adcom doesn't care about technical details in your app, let alone graphic or web design work. That won't help add value in the classroom. They want to see that you have valuable people skills and judgement.