KickstartCassiopeia has the option to use rounded corners on lots of elements all at once.
This movie shows you how easy it is to setup a new style in KickstartCassiopeia.
This website show the footer setup with multiple columns. This article explains how this is done.
KickstartCassiopeia has the option to create rounded buttons on your website.
In order to create a box shadow on certain elements you can use CSS. This tutorial explains how you can create a neat shadow for your boxes.