Great package.

There's a z-index issue with the colorpicker that causes some display issues in the back office.  To fix, just add z-index: 10000; to .colorpicker (first css class, lines 1-9).  Modified code looks like this:

.colorpicker {
width: 356px;
height: 176px;
overflow: hidden;
position: absolute;
background: url(/umbraco/images/colorpicker/colorpicker_background.png);
font-family: Arial, Helvetica, sans-serif;
display: none;
        z-index: 10000;
}