I looked at another commercial blog the other day and liked its look and feel before discovering its theme was K2 so I downloaded it, played with it and voila!
So I have temporarily (?) abandoned the rather fabby fspring theme from Fredrik Fahlstad (which I am still using as basis for a number of other blogs) and playing with this one for now.
You see, this is one of the great things about separating content from style: you can always modify the style without needing to recreate the content. WordPress and the themes people develop for it just make things easier.