Sky by Mowmo is a nice Symbian S60 5th edition theme for Nokia 5800 XpressMusic, N97 and 5530 XpressMusic. Its is a bright color theme and pretty impressive.

Sky theme by Mowmo comes with custom icons. The custom icons of this theme are quite big and round shaped like the iPhone icons. The theme is good in performance and transparent too.

Its a very colorful theme. You can try this theme on your S60 mobiles. Following is the download link for this theme.
Download