Oh! Sorry James, bit of a breakdown of communication we had there
Alrighty, well if you take a look at the index.html for whichever template, you can see it's pretty well laid out and valid code, we have class names assigned to things that need them. The CSS files might actually be a little too "verbose" (more styling than really needed) but it's all very capable and ready to be changed
If you are interested in customizing a template you probably should base it on the Modern one and not the others as its the only with 100% valid markup (as far as I know).
If you do not use Firebug already, I highly suggest you take a look - the Inspect Element option in the right-click menu is
fantastic. Good luck and happy tinkering!