Hi Manfred,
Yes, it's possible. Becuase each menu item has it's own unique ID class name, for example, from 1st link "itemid-243" (check classes in < body > sourcecode ) so you can use to build custom styles (BG color) for those.
But there is "small" problem, we cannot help in customizations. But I can give you useful tip:
.itemid-243 #sp-left .sp-module:first-child {
padding: 140px 60px !important;
background: rgba(208,232,192, 0.9) !important;
}
Now it's your turn.

BTW
You can also create custom class names for modules etc. Anyway... there are few methods to do this.