Discover the modern experiences you can build with SharePoint Online
Microsoft have published a great new resource that can be used to get inspired while designing your Intranet.
Take a look at: https://sharepointlookbook.azurewebsites.net/#examples to see some great examples. You can even download a “look book” in PDF format.
Once you’ve got an idea on a design style you can visit: https://spdesign.azurewebsites.net/ to guide you through some of the more advanced SharePoint functionality using web parts.