@Justin: For border radius, you can add the following css in “Appearance => Customize => Theme Options => Custom CSS Options” box:
#featured-grid-content .wrapper {
    border-radius: 25px;
    -moz-border-radius: 25px;
    -webkit-border-radius: 25px;
}
#featured-grid-content .grid-box.first {
    border-radius: 25px 0 0 25px;
    -moz-border-radius: 25px 0 0 25px;
    -webkit-border-radius: 25px 0 0 25px;
}
#featured-grid-content .grid-box + .grid-box {
     border-radius: 0 25px 0 0;
    -moz-border-radius: 0 25px 0 0;
    -webkit-border-radius: 0 25px 0 0;
}
#featured-grid-content .grid-box + .grid-box + .grid-box  {
     border-radius: 0 0 25px;
    -moz-border-radius: 0 0 25px;
    -webkit-border-radius: 0 0 25px;
}
I don’t think box shadow will be visible in grid content, as it has hover effect.