Display posts in drop down menu

I need to create a custom dropdown menu which will display post in a dropdown menu. I managed to do it by modifying nav-menu-template.php file, but at the moment it displays the same post for all dropdowns. What I need is, show icons and some text for each menu, for instance, for Products dropdown post id 100, for Services post id 200 etc. Maybe it can be made using Widgets, but I don’t know how exactly, so please help, really need this.