This is incredibly useful for anyone designing a new site from scratch. I think it's quite useful for reimagining the colors of your existing site, too, with one caveat. I'd love to be able to enter some of my own colors - and have your tool suggest a color palette.
Not the easiest feature to add, but would be exceptionally useful. Either way, I love what you do, mackenziechild and have followed your work for years.
You have inspired me over and over to improve DarwinMail [1]. Some of your small design tips have vastly improved the UI of DarwinMail. Thank you so much for all your tutorials, tweets and general design inspiration.
PS: I also love that you were a designer first, and decided to learn how to code too. It's so useful to learn in that order. No wonder your projects are always so brilliant.