How do I Start over with upfront?

So I installed Spirt and just started playing with it to figure it out. Got to the point now where I think I get it and could make a much better site and customize the theme from the beginning to make it my own. I would like to just blow it away now that I get the basics since is made so many in line changes and did not customize the theme (Colors, fonts, etc) to start with. I would like to just purge the whole thing and start from the beginning now. Is there an easy way to do this?