Once you've successfully connected to the Launchpad using the standard Fiori client it will persist this path for subsequent logins, but I am under the impression that you need to build a custom client with the associated config information in order to pre-define the path, and the icon.
BTW - if you are just interested in showing the experience of the Fiori Client, the demo mode works very nicely and showcases the SAP Fiori, cloud edition.