How old are you? Do you have a feel for the kind of look you want to go for yet? One way to keep it fresh is to incorporate casual gear into smart looks. I have been trying something similar myself recently. See here... http://www.fashionbeans.com/forums/g...rt-casual.html
I think the main thing is getting the fit right though. Then you can look at injecting some colour (plenty of articles on here about key colour trends), and using accessories. What about some bright socks in an otherwise conservative outfit.
Are you thinking mainly about your smart work outfits, or casual stuff?