A splash of colour
Now it's time to add those great corporate colours and images to the wireframe. Since you've got a fair idea about the branding from your visual audit and no doubt you had comments from your scripted walkthrough, it shouldn't be to hard to accomplice.
Natural Selections: Colors Found in Nature and Interface Design is another great from Boxes and Arrows that talks about selecting the best type of imagery for the site, which of course iStockPro has a nifty tool to do just that and of course don't forgot about harmonising these colours!
While you're adding colour to the site don't forget if you have requirements for colour blindness