There are many outstanding layouts available for postnuke from commercialvendors to freeware distributors. It is quite likely that these will meet yourserious design needs well, especially ones from the commercial vendors,some of whom even provide customization services.But if you are looking to start building your own theme from scratch, I'llstrongly recommend that you first take the smaller steps and modify anexisting theme. That way you'll develop a good understanding of howPostNuke achieves it's layouts.Once you are good at that, you can use that knowledge to create youroriginal themes from scratch. Have fun putting your photoshop skillsto test.All the best.