If you're looking for a classier look than the cartoony standard S60 5th Edition interface then give the Blue Shadow Theme a try.
The free theme applies an eye-catching new background wallpaper to your home screen. The blue symbols used in this wallpaper are a kind of Celtic/alien crossover, and they automatically gray out when you open the context menu.
The Blue Shadow Theme also features a new set of icons. Again, the style of the icons in Blue Shadow Theme is very unique, and the silver and blue color works well against the dark background. The only trouble is that the icons bear no real relevance to the task or application they represent. This can make it difficult to navigate through menus at times.
If you're looking for a fresh new look for your phone, Blue Shadow Theme provides an interesting option.