hi, I have check you site dir draft2. to add custom color block please open file admin/functions/functions-standard.php, find this line
<span title="color8" class="color_color8"></span> copy it and paste it right after this line, change it title and class value to what you want, for example name it tile with color9 and class to color_color9, after this add css rule for class color_color9 in file admin/assets/css/adminstyles.css.
I have try to open sk file with poeidt, but failed. it says ‘cannot convert file to unicode’. I guess you file may be with wrong encoded with ansi, please manage change it to utf8 for a try.