If you are new to RapidWeaver, you are probably on the scrounge for cheap or preferably "free" theme designs to play with! Eclipse is a good theme to start your journey with, as a precursor to more advanced themes like Media.
Eclipse opts for a conventional 2-column content / sidebar layout, a fully accessible drop-down menu system, RapidWeaver dragged-and-dropped banner image support, and a decent choice of style and colour settings to change. It also gently introduces you to new theme techniques like ExtraContent, responsive web design and social media icons.
If you need to get a basic website built and you don't care for features like huge banners that consume miles of space, Eclipse could be ideal.
Eclipse requires RapidWeaver 8 or later.